Standard Column Descriptions

This file is an auto-generated version of column_descriptions.csv, which contains the descriptions of table column names regardless of what file(s) they appear in.

Name	Type	Units	Description
ABSMAG_R	float64		Absolute magnitude in the r-band after k-correction
AIRMASS	float32		Average airmass during this exposure
AIRMASS_GFA	float64		Average airmass during this exposure as measured by GFA
APFLUX_G	float32	nanomaggy	Total flux in nanomaggies extracted in a 0.75 arcsec radius in the g band at this location
APFLUX_IVAR_G	float32	nanomaggy^-2	Inverse variance of APFLUX_G
APFLUX_IVAR_R	float32	nanomaggy^-2	Inverse variance of APFLUX_R
APFLUX_IVAR_Z	float32	nanomaggy^-2	Inverse variance of APFLUX_Z
APFLUX_R	float32	nanomaggy	Total flux in nanomaggies extracted in a 0.75 arcsec radius in the r band at this location
APFLUX_Z	float32	nanomaggy	Total flux in nanomaggies extracted in a 0.75 arcsec radius in the z band at this location
A_MGII	float32		Fitted parameter A (amplitude) by MgII fitter
BGS_TARGET	int64		BGS (Bright Galaxy Survey) target selection bitmask
BITWEIGHTS	int64[2]		A size of two 64 bit masks that encodes which of the alternative assignment histories that the target was assigned in
BLOBDIST	float32	pix	Maximum distance from a detected Legacy Surveys source
BRICKID	int32		Brick ID from tractor input
BRICKNAME	char[8]		Brick name from tractor input
BRICK_OBJID	int32		Imaging Surveys OBJID on that brick
B_MGII	float32		Fitted parameter B (constant) by MgII fitter
CAMERA	char[2]		Camera identifier. Passband and SPECGRPH ([brz][0-9]).
CHECKER	char[5]		Initials of researcher who vetted the target
CHI2	float64		Best fit chi squared
CMX_TARGET	int64		Target selection bitmask for commissioning
COADD_EXPTIME	float32	s	Summed exposure time for coadd
COADD_FIBERSTATUS	int32		bitwise-AND of input FIBERSTATUS
COADD_NUMEXP	int16		Number of exposures in coadd
COADD_NUMNIGHT	int16		Number of nights in coadd
COADD_NUMTILE	int16		Number of tiles in coadd
COEFF	float64[10]		Redrock template coefficients
COMP_TILE	float64		Assignment completeness for all targets of this type with the same value for TILES
C_CIII	float32		Confidence for CIII line
C_CIV	float32		Confidence for CIV line
C_Halpha	float32		Confidence for Halpha line
C_Hbeta	float32		Confidence for Hbeta line
C_LYA	float32		Confidence for LyA line, i.e. ~probability to be a QSO
C_MgII	float32		Confidence for MgII line
DCHISQ	float32[5]		Difference in chi-squared between Tractor model fits
DEC	float64	deg	Barycentric declination in ICRS
DEC_IVAR	float32	deg^-2	Inverse variance of DEC, excluding astrometric calibration errors
DELTACHI2	float64		chi2 difference between first- and second-best redrock template fits
DELTA_CHI2	float32		Difference of chi2 between redrock fit and MgII fitter over the lambda interval considered during the fit
DELTA_X	float64	mm	CS5 X requested minus actual position
DELTA_Y	float64	mm	CS5 Y requested minus actual position
DESI_TARGET	int64		DESI (dark time program) target selection bitmask
DESINAME	char[22]		Human readable identifier of a sky location precise to ~0.36 arcseconds. Note multiple objects can map to a single DESINAME if very close on the sky.
DEVICE_LOC	int32		Device location on focal plane [0-523]
DEVICE_TYPE	char[3]		Device type
EBV	float32	mag	Galactic extinction E(B-V) reddening from SFD98
EFFTIME_ETC	float64	s	Effective exposure time for nominal conditions inferred from ETC data
EFFTIME_SPEC	float64	s	Effective exposure time for nominal conditions derived from the TSNR2 fits to the spectroscopy
EQ_ALL_0P0	float64		e-correction at redshift=0.0
EQ_ALL_0P1	float64		e-correction at redshift=0.1
EXPID	int32		DESI Exposure ID number
EXPTIME	float64	s	Length of time shutter was open
FAFLAVOR	char[*]		Fiberassign flavor name
FAPRGRM	char[*]		Fiberassign program name
FA_TARGET	int64		Targeting bit internally used by fiberassign (linked with FA_TYPE)
FA_TYPE	binary		Fiberassign internal target type (science, standard, sky, safe, suppsky)
FIBER	int32		Fiber ID on the CCDs [0-4999]
FIBERASSIGN_X	float32	mm	Fiberassign expected CS5 X location on focal plane
FIBERASSIGN_Y	float32	mm	Fiberassign expected CS5 Y location on focal plane
FIBERFLUX_G	float32	nanomaggy	Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing
FIBERFLUX_R	float32	nanomaggy	Predicted r-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing
FIBERFLUX_Z	float32	nanomaggy	Predicted z-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing
FIBERFLUX_IVAR_G	float32	nanomaggy^-2	Inverse variance of FIBERFLUX_G
FIBERFLUX_IVAR_R	float32	nanomaggy^-2	Inverse variance of FIBERFLUX_R
FIBERFLUX_IVAR_Z	float32	nanomaggy^-2	Inverse variance of FIBERFLUX_Z
FIBERSTATUS	int32		Fiber status mask. 0=good
FIBERTOTFLUX_G	float32	nanomaggy	Predicted g-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
FIBERTOTFLUX_R	float32	nanomaggy	Predicted r-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
FIBERTOTFLUX_W1	float32	nanomaggy	Predicted WISE W1-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
FIBERTOTFLUX_W2	float32	nanomaggy	Predicted WISE W2-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
FIBERTOTFLUX_Z	float32	nanomaggy	Predicted z-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
FIBER_DEC	float64	deg	DEC of actual fiber position
FIBER_RA	float64	deg	RA of actual fiber position
FIBER_X	float64	mm	CS5 X location requested by PlateMaker
FIBER_Y	float64	mm	CS5 Y location requested by PlateMaker
FLUX_G	float32	nanomaggy	Flux in the Legacy Survey g-band (AB)
FLUX_G_DERED	float32	nanomaggy	Flux in the g-band after correcting for Galactic extinction (AB system)
FLUX_IVAR_G	float32	nanomaggy^-2	Inverse variance of FLUX_G (AB)
FLUX_IVAR_R	float32	nanomaggy^-2	Inverse variance of FLUX_R (AB)
FLUX_IVAR_W1	float32	nanomaggy^-2	Inverse variance of FLUX_W1 (AB)
FLUX_IVAR_W2	float32	nanomaggy^-2	Inverse variance of FLUX_W2 (AB)
FLUX_IVAR_Z	float32	nanomaggy^-2	Inverse variance of FLUX_Z (AB)
FLUX_R	float32	nanomaggy	Flux in the Legacy Survey r-band (AB)
FLUX_R_DERED	float32	nanomaggy	Flux in the r-band after correcting for Galactic extinction (AB system)
FLUX_W1	float32	nanomaggy	WISE flux in W1 (AB)
FLUX_W1_DERED	float32	nanomaggy	Flux in the WISE W1-band after correcting for Galactic extinction (AB system)
FLUX_W2	float32	nanomaggy	WISE flux in W2 (AB)
FLUX_W2_DERED	float32	nanomaggy	Flux in the WISE W2-band after correcting for Galactic extinction (AB system)
FLUX_Z	float32	nanomaggy	Flux in the Legacy Survey z-band (AB)
FLUX_Z_DERED	float32	nanomaggy	Flux in the z-band after correcting for Galactic extinction (AB system)
FRACZ_TILELOCID	float64		The fraction of targets of this type at this TILELOCID that received an observation (after forcing each target to a unique TILELOCID)
GAIA_ASTROMETRIC_EXCESS_NOISE	float32		Gaia astrometric excess noise
GAIA_ASTROMETRIC_PARAMS_SOLVED	int64		which astrometric parameters were estimated for a Gaia source
GAIA_ASTROMETRIC_SIGMA5D_MAX	float32	mas	Gaia longest semi-major axis of the 5-d error ellipsoid
GAIA_DEC	float64	deg	Gaia ICRS declination
GAIA_DUPLICATED_SOURCE	bool		Gaia duplicated source flag
GAIA_PHOT_BP_MEAN_FLUX_OVER_ERROR	float32		Gaia BP band signal-to-noise
GAIA_PHOT_BP_MEAN_MAG	float32	mag	Gaia BP band magnitude
GAIA_PHOT_BP_N_OBS	int32		Gaia BP band number of observations
GAIA_PHOT_BP_RP_EXCESS_FACTOR	float32		Gaia BP/RP excess factor
GAIA_PHOT_G_MEAN_FLUX_OVER_ERROR	float32		Gaia G band signal-to-noise
GAIA_PHOT_G_MEAN_MAG	float32	mag	Gaia G band magnitude
GAIA_PHOT_G_N_OBS	int32		Gaia G band number of observations
GAIA_PHOT_RP_MEAN_FLUX_OVER_ERROR	float32		Gaia RP band signal-to-noise
GAIA_PHOT_RP_MEAN_MAG	float32	mag	Gaia RP band magnitude
GAIA_PHOT_RP_N_OBS	int32		Gaia RP band number of observations
GAIA_RA	float64	deg	Gaia ICRS right ascension
GALDEPTH_G	float32	nanomaggy^-2	Galaxy model-based depth in LS g-band
GALDEPTH_R	float32	nanomaggy^-2	Galaxy model-based depth in LS r-band
GALDEPTH_Z	float32	nanomaggy^-2	Galaxy model-based depth in LS z-band
GOODHARDLOC	bool		True/False whether the fiber had good hardware
GOODPRI	bool		True/False whether the priority of what was assigned to the location was <= the base priority of the given target class
GOODTSNR	bool		True/False whether the TSNR_<class> value used was above the minimum threshold for the given target class
HALPHA_CHI2	float32		Reduced chi2 of the fit for the HALPHA line
HALPHA_CONT	float32	10**-17 erg/(s cm2 Angstrom)	Continuum used for the fitting (fixed value) for the HALPHA line
HALPHA_CONT_IVAR	float32	10**+34 (s2 cm4 Angstrom2) / erg2	Inverse variance of the continuum for the HALPHA line
HALPHA_EW	float32	Angstrom	Fitted rest-frame equivalent width for the HALPHA line
HALPHA_EW_IVAR	float32	Angstrom^-2	Inverse variance of the fitted rest-frame equivalent width for the HALPHA line
HALPHA_FLUX	float32	10**-17 erg/(s cm2)	Fitted flux for the HALPHA line
HALPHA_FLUX_IVAR	float32	10**+34 (s2 cm4) / erg2	Inverse variance of the fitted flux for the HALPHA line
HALPHA_NDOF	int32		Number of degrees of freedom of the fit for the HALPHA line
HALPHA_SHARE	float32		NaN (SHARE not relevant for HALPHA line)
HALPHA_SHARE_IVAR	float32		NaN (SHARE not relevant for HALPHA line)
HALPHA_SIGMA	float32	Angstrom	Fitted line width (in the observed frame) for the HALPHA line
HALPHA_SIGMA_IVAR	float32	Angstrom^-2	Inverse variance of the fitted line width (in the observed frame) for the HALPHA line
HBETA_CHI2	float32		Reduced chi2 of the fit for the HBETA line
HBETA_CONT	float32	10**-17 erg/(s cm2 Angstrom)	Continuum used for the fitting (fixed value) for the HBETA line
HBETA_CONT_IVAR	float32	10**+34 (s2 cm4 Angstrom2) / erg2	Inverse variance of the continuum for the HBETA line
HBETA_EW	float32	Angstrom	Fitted rest-frame equivalent width for the HBETA line
HBETA_EW_IVAR	float32	Angstrom^-2	Inverse variance of the fitted rest-frame equivalent width for the HBETA line
HBETA_FLUX	float32	10**-17 erg/(s cm2)	Fitted flux for the HBETA line
HBETA_FLUX_IVAR	float32	10**+34 (s2 cm4) / erg2	Inverse variance of the fitted flux for the HBETA line
HBETA_NDOF	int32		Number of degrees of freedom of the fit for the HBETA line
HBETA_SHARE	float32		NaN (SHARE not relevant for HBETA line)
HBETA_SHARE_IVAR	float32		NaN (SHARE not relevant for HBETA line)
HBETA_SIGMA	float32	Angstrom	Fitted line width (in the observed frame) for the HBETA line
HBETA_SIGMA_IVAR	float32	Angstrom^-2	Inverse variance of the fitted line width (in the observed frame) for the HBETA line
HDELTA_CHI2	float32		Reduced chi2 of the fit for the HDELTA line
HDELTA_CONT	float32	10**-17 erg/(s cm2 Angstrom)	Continuum used for the fitting (fixed value) for the HDELTA line
HDELTA_CONT_IVAR	float32	10**+34 (s2 cm4 Angstrom2) / erg2	Inverse variance of the continuum for the HDELTA line
HDELTA_EW	float32	Angstrom	Fitted rest-frame equivalent width for the HDELTA line
HDELTA_EW_IVAR	float32	Angstrom^-2	Inverse variance of the fitted rest-frame equivalent width for the HDELTA line
HDELTA_FLUX	float32	10**-17 erg/(s cm2)	Fitted flux for the HDELTA line
HDELTA_FLUX_IVAR	float32	10**+34 (s2 cm4) / erg2	Inverse variance of the fitted flux for the HDELTA line
HDELTA_NDOF	int32		Number of degrees of freedom of the fit for the HDELTA line
HDELTA_SHARE	float32		NaN (SHARE not relevant for HDELTA line)
HDELTA_SHARE_IVAR	float32		NaN (SHARE not relevant for HDELTA line)
HDELTA_SIGMA	float32	Angstrom	Fitted line width (in the observed frame) for the HDELTA line
HDELTA_SIGMA_IVAR	float32	Angstrom^-2	Inverse variance of the fitted line width (in the observed frame) for the HDELTA line
HEALPIX	int32		HEALPixel containing this location at NSIDE=64 in the NESTED scheme
HGAMMA_CHI2	float32		Reduced chi2 of the fit for the HGAMMA line
HGAMMA_CONT	float32	10**-17 erg/(s cm2 Angstrom)	Continuum used for the fitting (fixed value) for the HGAMMA line
HGAMMA_CONT_IVAR	float32	10**+34 (s2 cm4 Angstrom2) / erg2	Inverse variance of the continuum for the HGAMMA line
HGAMMA_EW	float32	Angstrom	Fitted rest-frame equivalent width for the HGAMMA line
HGAMMA_EW_IVAR	float32	Angstrom^-2	Inverse variance of the fitted rest-frame equivalent width for the HGAMMA line
HGAMMA_FLUX	float32	10**-17 erg/(s cm2)	Fitted flux for the HGAMMA line
HGAMMA_FLUX_IVAR	float32	10**+34 (s2 cm4) / erg2	Inverse variance of the fitted flux for the HGAMMA line
HGAMMA_NDOF	int32		Number of degrees of freedom of the fit for the HGAMMA line
HGAMMA_SHARE	float32		NaN (SHARE not relevant for HGAMMA line)
HGAMMA_SHARE_IVAR	float32		NaN (SHARE not relevant for HGAMMA line)
HGAMMA_SIGMA	float32	Angstrom	Fitted line width (in the observed frame) for the HGAMMA line
HGAMMA_SIGMA_IVAR	float32	Angstrom^-2	Inverse variance of the fitted line width (in the observed frame) for the HGAMMA line
HPXPIXEL	int64		HEALPixel containing this location at NSIDE=64 in the NESTED scheme
IN_DESI	int16		Used by fiberassign to make a tile in the DESI footprint; always set to 1
IN_RADIUS	float32	arcsec	Radius used to set the IN_BRIGHT_OBJECT bit in the DESI_TARGET bitmask.
IS_QSO_MGII	bool		Boolean: True if the object passes the MgII selection
IS_QSO_QN	int16		Spectroscopic classification from QuasarNET (1 for a quasar)
KCORR_G0P0	float64		g-band k-correction at redshift=0.0
KCORR_G0P1	float64		g-band k-correction at redshift=0.1
KCORR_R0P0	float64		r-band k-correction at redshift=0.0
KCORR_R0P1	float64		r-band k-correction at redshift=0.1
LAMBDA_REF	float32	Angstrom	Requested wavelength at which targets should be centered on fibers
LASTNIGHT	int32		Final night of observation included in a series of coadds
LC_FLUX_IVAR_W1	float32[15]	nanomaggy^-2	Inverse variance of LC_FLUX_W1 (AB system; defaults to zero for unused entries)
LC_FLUX_IVAR_W2	float32[15]	nanomaggy^-2	Inverse variance of LC_FLUX_W2 (AB system; defaults to zero for unused entries)
LC_FLUX_W1	float32[15]	nanomaggy	FLUX_W1 in each of up to fifteen unWISE coadd epochs (AB system; defaults to zero for unused entries)
LC_FLUX_W2	float32[15]	nanomaggy	FLUX_W2 in each of up to fifteen unWISE coadd epochs (AB system; defaults to zero for unused entries)
LC_MJD_W1	float64[15]		MJD_W1 in each of up to fifteen unWISE coadd epochs (defaults to zero for unused entries)
LC_MJD_W2	float64[15]		MJD_W2 in each of up to fifteen unWISE coadd epochs (defaults to zero for unused entries)
LC_NOBS_W1	int16[15]		NOBS_W1 in each of up to fifteen unWISE coadd epochs
LC_NOBS_W2	int16[15]		NOBS_W2 in each of up to fifteen unWISE coadd epochs
LOCATION	int64		Location on the focal plane PETAL_LOC*1000 + DEVICE_LOC
LOCATION_ASSIGNED	bool		True/False for assigned/unassigned for the target in question
LRG_MASK	binary		Imaging mask bits relevant to LRG targets
MAIN_NSPEC	int32		Number of coadded spectra for this TARGETID in Main survey
MAIN_PRIMARY	bool		Boolean flag (True/False) for the primary coadded spectrum in Main survey
MASKBITS	int16		Bitwise mask from the imaging indicating potential issue or blending
MEAN_DELTA_X	float32	mm	Mean (over exposures) fiber difference requested - actual CS5 X location on focal plane
MEAN_DELTA_Y	float32	mm	Mean (over exposures) fiber difference requested - actual CS5 Y location on focal plane
MEAN_FIBER_DEC	float64	deg	Mean (over exposures) DEC of actual fiber position
MEAN_FIBER_RA	float64	deg	Mean (over exposures) RA of actual fiber position
MEAN_FIBER_X	float32	mm	Mean (over exposures) fiber CS5 X location on focal plane
MEAN_FIBER_Y	float32	mm	Mean (over exposures) fiber CS5 Y location on focal plane
MEAN_PSF_TO_FIBER_SPECFLUX	float32		Mean of input exposures fraction of light from point-like source captured by 1.5 arcsec diameter fiber given atmospheric seeing
MEDIAN_CALIB_COUNT_B	float64		Median of calibrated flux in B camera
MEDIAN_CALIB_COUNT_R	float64		Median of calibrated flux in R camera
MEDIAN_CALIB_COUNT_Z	float64		Median of calibrated flux in Z camera
MEDIAN_CALIB_SNR_B	float64		Median(S/N) of calibrated flux in B camera
MEDIAN_CALIB_SNR_R	float64		Median(S/N) of calibrated flux in R camera
MEDIAN_CALIB_SNR_Z	float64		Median(S/N) of calibrated flux in Z camera
MEDIAN_FFLAT_COUNT_B	float64		Median of fiber-flatfielded counts in B camera
MEDIAN_FFLAT_COUNT_R	float64		Median of fiber-flatfielded counts in R camera
MEDIAN_FFLAT_COUNT_Z	float64		Median of fiber-flatfielded counts in Z camera
MEDIAN_FFLAT_SNR_B	float64		Median(S/N) of fiberflatfielded counts in B camera
MEDIAN_FFLAT_SNR_R	float64		Median(S/N) of fiberflatfielded counts in R camera
MEDIAN_FFLAT_SNR_Z	float64		Median(S/N) of fiberflatfielded counts in Z camera
MEDIAN_RAW_COUNT_B	float64		Median of raw counts in B camera
MEDIAN_RAW_COUNT_R	float64		Median of raw counts in R camera
MEDIAN_RAW_COUNT_Z	float64		Median of raw counts in Z camera
MEDIAN_RAW_SNR_B	float64		Median(raw signal/noise) in B camera
MEDIAN_RAW_SNR_R	float64		Median(raw signal/noise) in R camera
MEDIAN_RAW_SNR_Z	float64		Median(raw signal/noise) in Z camera
MEDIAN_SKYSUB_COUNT_B	float64		Median of sky-subtracted counts in B camera
MEDIAN_SKYSUB_COUNT_R	float64		Median of sky-subtracted counts in R camera
MEDIAN_SKYSUB_COUNT_Z	float64		Median of sky-subtracted counts in Z camera
MEDIAN_SKYSUB_SNR_B	float64		Median(S/N) of sky-subtracted counts in B camera
MEDIAN_SKYSUB_SNR_R	float64		Median(S/N) of sky-subtracted counts in R camera
MEDIAN_SKYSUB_SNR_Z	float64		Median(S/N) of sky-subtracted counts in Z camera
MJD	float64	d	Modified Julian Date when shutter was opened for this exposure
MJD_BEGIN	float64	d	Start of the allowed observing window for this target (Modified Julian Date)
MJD_END	float64	d	End of the allowed observing window for this target (Modified Julian Date)
MORPHTYPE	char[4]		Imaging Surveys morphological type from Tractor
MWS_TARGET	int64		Milky Way Survey targeting bits
MW_TRANSMISSION_G	float32		Milky Way dust transmission in LS g-band
MW_TRANSMISSION_R	float32		Milky Way dust transmission in LS r-band
MW_TRANSMISSION_W1	float32		Milky Way dust transmission in WISE W1
MW_TRANSMISSION_W2	float32		Milky Way dust transmission in WISE W2
MW_TRANSMISSION_W3	float32		Milky Way dust transmission in WISE W3
MW_TRANSMISSION_W4	float32		Milky Way dust transmission in WISE W4
MW_TRANSMISSION_Z	float32		Milky Way dust transmission in LS z-band
NCOEFF	int64		Number of Redrock template coefficients
NEAR_RADIUS	float32	arcsec	Radius used to set the NEAR_BRIGHT_OBJECT bit in the DESI_TARGET bitmask.
NIGHT	int32		Night of observation (YYYYMMDD) starting at local noon before observations start
NOBS_G	int16		Number of images for central pixel in g-band
NOBS_R	int16		Number of images for central pixel in r-band
NOBS_Z	int16		Number of images for central pixel in z-band
NPIXELS	int64		Number of unmasked pixels contributing to the Redrock fit
NTILE	int64		Number of tiles target was available on
NUMOBS	int64		Number of spectroscopic observations (on this specific, single tile)
NUMOBS_INIT	int64		Initial number of observations for target calculated across target selection bitmasks and OBSCONDITIONS
NUMOBS_MORE	int64		Number of additional observations needed
NUMTARGET	int16		Total number of targets that this positioner covered
NUM_ITER	int64		Number of positioner iterations
NZ	float64	h^3 Mpc^-3	The comoving number density of the tracer at the given redshift, assuming complete sample
O2C	float64		The criteria for assessing strength of OII emission for ELG observations
OBJID	int32		Imaging Surveys OBJID on that brick (renamed BRICK_OBJID)
OBJTYPE	char[3]		Object type: TGT, SKY, NON, BAD
OBSCONDITIONS	int32		Bitmask of allowed observing conditions
OCLAYER	char[6]		Either ‘DARK’ for dark-time or ‘BRIGHT’ to observe in either bright- or dark-time
OIII_CHI2	float32		Reduced chi2 of the fit for the [OIII] doublet
OIII_CONT	float32	10**-17 erg/(s cm2 Angstrom)	Continuum used for the fitting (fixed value) for the [OIII] doublet
OIII_CONT_IVAR	float32	10**+34 (s2 cm4 Angstrom2) / erg2	Inverse variance of the continuum for the [OIII] doublet
OIII_EW	float32	Angstrom	Fitted rest-frame equivalent width for the [OIII] doublet
OIII_EW_IVAR	float32	Angstrom^-2	Inverse variance of the fitted rest-frame equivalent width for the [OIII] doublet
OIII_FLUX	float32	10**-17 erg/(s cm2)	Fitted flux for the [OIII] doublet
OIII_FLUX_IVAR	float32	10**+34 (s2 cm4) / erg2	Inverse variance of the fitted flux for the [OIII] doublet
OIII_NDOF	int32		Number of degrees of freedom of the fit for the [OIII] doublet
OIII_SHARE	float32		F1/(F0+F1) for the [OIII] doublet, where F0 and F1 are the individual line fluxes (SHARE value fixed during the fit)
OIII_SHARE_IVAR	float32		Infinite value, as SHARE is fixed during the fit
OIII_SIGMA	float32	Angstrom	Fitted line width (in the observed frame) for the [OIII] doublet
OIII_SIGMA_IVAR	float32	Angstrom^-2	Inverse variance of the fitted line width (in the observed frame) for the [OIII] doublet
OII_CHI2	float32		Reduced chi2 of the fit for the [OII] doublet
OII_CONT	float32	10**-17 erg/(s cm2 Angstrom)	Continuum used for the fitting (fixed value) for the [OII] doublet
OII_CONT_IVAR	float32	10**+34 (s2 cm4 Angstrom2) / erg2	Inverse variance of the continuum for the [OII] doublet
OII_EW	float32	Angstrom	Fitted rest-frame equivalent width for the [OII] doublet
OII_EW_IVAR	float32	Angstrom^-2	Inverse variance of the fitted rest-frame equivalent width for the [OII] doublet
OII_FLUX	float32	10**-17 erg/(s cm2)	Fitted flux for the [OII] doublet
OII_FLUX_IVAR	float32	10**+34 (s2 cm4) / erg2	Inverse variance of the fitted flux for the [OII] doublet
OII_NDOF	int32		Number of degrees of freedom of the fit for the [OII] doublet
OII_SHARE	float32		Fitted F1/(F0+F1) for the [OII] doublet, where F0 and F1 are the individual line fluxes
OII_SHARE_IVAR	float32		Inverse variance of the fitted F1/(F0+F1) for the [OII] doublet
OII_SIGMA	float32	Angstrom	Fitted line width (in the observed frame) for the [OII] doublet
OII_SIGMA_IVAR	float32	Angstrom^-2	Inverse variance of the fitted line width (in the observed frame) for the [OII] doublet
PARALLAX	float32	mas	Reference catalog parallax
PARALLAX_IVAR	float32	mas^-2	Inverse variance of PARALLAX
PETAL_LOC	int16		Petal location [0-9]
PHOTSYS	char[1]		‘N’ for the MzLS/BASS photometric system, ‘S’ for DECaLS
PLATE_DEC	float64	deg	Barycentric Declination in ICRS to be used by PlateMaker
PLATE_RA	float64	deg	Barycentric Right Ascension in ICRS to be used by PlateMaker
PLATE_REF_EPOCH	float64	yr	Copy of REF_EPOCH to be used by PlateMaker
PMDEC	float32	mas yr^-1	Proper motion in the +Dec direction
PMDEC_IVAR	float32	yr^2 mas^-2	Inverse variance of PMDEC
PMRA	float32	mas yr^-1	proper motion in the +RA direction (already including cos(dec))
PMRA_IVAR	float32	yr^2 mas^-2	Inverse variance of PMRA
PRIORITY	int32		Target current priority
PRIORITY_INIT	int64		Target initial priority from target selection bitmasks and OBSCONDITIONS
PROBA_RF	float32		Probability of being a quasar generated by the quasar Random Forest targeting algorithm.
PROB_OBS	float64		The number alternative assignment histories that the target was assigned in divided by 128
PROGRAM	char[6]		DESI program type - BRIGHT, DARK, BACKUP, OTHER
PSFDEPTH_G	float32	nanomaggy^-2	PSF-based depth in g-band
PSFDEPTH_R	float32	nanomaggy^-2	PSF-based depth in r-band
PSFDEPTH_W1	float32	nanomaggy^-2	PSF-based depth in WISE W1
PSFDEPTH_W2	float32	nanomaggy^-2	PSF-based depth in WISE W2
PSFDEPTH_Z	float32	nanomaggy^-2	PSF-based depth in z-band
PSFSIZE_G	float32	arcsec	Median PSF size evaluated at the BRICK_PRIMARY objects in this brick in g-band
PSFSIZE_R	float32	arcsec	Median PSF size evaluated at the BRICK_PRIMARY objects in this brick in r-band
PSFSIZE_Z	float32	arcsec	Median PSF size evaluated at the BRICK_PRIMARY objects in this brick in z-band
PSF_TO_FIBER_SPECFLUX	float64		fraction of light from point-like source captured by 1.5 arcsec diameter fiber given atmospheric seeing
RA	float64	deg	Barycentric Right Ascension in ICRS
RA_IVAR	float32	deg^-2	Inverse variance of RA (no cosine term!), excluding astrometric calibration errors
REF_CAT	char[2]		Reference catalog source for star: ‘T2’ for Tycho-2, ‘G2’ for Gaia DR2, ‘L2’ for the SGA, empty otherwise
REF_EPOCH	float32	yr	Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia
REF_ID	int64		Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho-2; sourceid for Gaia DR2
REF_MAG	float32	mag	Magnitude used to calculate IN_RADIUS; typically, in order of preference, G-band for Gaia or VT then HP then BT for Tycho.
RELEASE	int16		Imaging surveys release ID
REST_GMR_0P0	float64		Rest-frame g-r colour at redshift=0.0
REST_GMR_0P1	float64		Rest-frame g-r colour at redshift=0.1
RMS_DELTA_X	float32	mm	RMS (over exposures) of the fiber difference between measured and requested CS5 X location on focal plane
RMS_DELTA_Y	float32	mm	RMS (over exposures) of the fiber difference between measured and requested CS5 Y location on focal plane
ROSETTE_NUMBER	int32		Rosette number ID [0-19]
ROSETTE_R	float64	deg	Radius from the center of the rosette to the target
SCND_TARGET	int64		Target selection bitmask for secondary programs
SCND_ORDER	int32		Number of row for target entry in secondary file (placeholder; needed by fiberassign)
SEEING_ETC	float64	arcsec	Average FWHM atmospheric seeing during this exposure as measured by ETC
SEEING_GFA	float64	arcsec	Average FWHM atmospheric seeing during this exposure as measured by GFA
SERSIC	float32		Power-law index for the Sersic profile model (MORPHTYPE=’SER’)
SERSIC_IVAR	float32		Inverse variance of SERSIC
SHAPEDEV_E1	float32		deVaucouleurs shape fit elipticity parameter e1
SHAPEDEV_E1_IVAR	float32		Inverse variance of SHAPEDEV_E1
SHAPEDEV_E2	float32		deVaucouleurs shape fit elipticity parameter e2
SHAPEDEV_E2_IVAR	float32		Inverse variance of SHAPEDEV_E2
SHAPEDEV_R	float32	arcsec	deVaucouleurs shape half-light radius
SHAPEDEV_R_IVAR	float32	arcsec^-2	Inverse variance of SHAPEDEV_R
SHAPEEXP_E1	float32		Imaging exponential shape fit elipticity parameter e1
SHAPEEXP_E1_IVAR	float32		Inverse variance of SHAPEEXP_E1
SHAPEEXP_E2	float32		Imaging exponential shape fit elipticity parameter e2
SHAPEEXP_E2_IVAR	float32		Inverse variance of SHAPEEXP_E2
SHAPEEXP_R	float32	arcsec	Imaging exponential shape half-light radius
SHAPEEXP_R_IVAR	float32	arcsec^-2	Inverse variance of SHAPEEXP_R
SHAPE_E1	float32		Ellipticity component 1 of galaxy model for galaxy type MORPHTYPE
SHAPE_E1_IVAR	float32		Inverse variance of SHAPE_E1
SHAPE_E2	float32		Ellipticity component 2 of galaxy model for galaxy type MORPHTYPE
SHAPE_E2_IVAR	float32		Inverse variance of SHAPE_E2
SHAPE_R	float32	arcsec	Half-light radius of galaxy model (>0)
SHAPE_R_IVAR	float32	arcsec^-2	Inverse variance of SHAPE_R
SIGMA_MGII	float32	Angstrom	Fitted parameter SIGMA (linewidth) by MgII fitter (in angstrom?)
SPECTRO	int16		Spectrograph number [0-9]
SPECTROID	int32		Hardware ID of spectrograph (not used)
SPECTYPE	char[6]		Spectral type of Redrock best fit template (e.g. GALAXY, QSO, STAR)
SPGRPVAL	int32		Value by which spectra are grouped for a coadd (e.g. a YEARMMDD night)
STD_FIBER_DEC	float32	arcsec	Standard deviation (over exposures) of DEC of actual fiber position
STD_FIBER_RA	float32	arcsec	Standard deviation (over exposures) of RA of actual fiber position
SUBPRIORITY	float64		Random subpriority [0-1) to break assignment ties
SUBTYPE	char[20]		Spectral subtype
SUM_CALIB_COUNT_B	float64		Sum of calibrated flux in B camera
SUM_CALIB_COUNT_R	float64		Sum of calibrated flux in R camera
SUM_CALIB_COUNT_Z	float64		Sum of calibrated flux in Z camera
SUM_FFLAT_COUNT_B	float64		Sum of fiber-flatfielded counts B camera
SUM_FFLAT_COUNT_R	float64		Sum of fiber-flatfielded counts R camera
SUM_FFLAT_COUNT_Z	float64		Sum of fiber-flatfielded counts Z camera
SUM_RAW_COUNT_B	float64		Sum of raw counts in B camera
SUM_RAW_COUNT_R	float64		Sum of raw counts in R camera
SUM_RAW_COUNT_Z	float64		Sum of raw counts in Z camera
SUM_SKYSUB_COUNT_B	float64		Sum of sky-subtracted counts in B camera
SUM_SKYSUB_COUNT_R	float64		Sum of sky-subtracted counts in R camera
SUM_SKYSUB_COUNT_Z	float64		Sum of sky-subtracted counts in Z camera
SURVEY	char[7]		Survey name
SV1_BGS_TARGET	int64		BGS (bright time program) target selection bitmask for SV1
SV1_DESI_TARGET	int64		DESI (dark time program) target selection bitmask for SV1
SV1_MWS_TARGET	int64		MWS (bright time program) target selection bitmask for SV1
SV1_SCND_TARGET	int64		Secondary target selection bitmask for SV1
SV2_BGS_TARGET	int64		BGS (bright time program) target selection bitmask for SV2
SV2_DESI_TARGET	int64		DESI (dark time program) target selection bitmask for SV2
SV2_MWS_TARGET	int64		MWS (bright time program) target selection bitmask for SV2
SV2_SCND_TARGET	int64		Secondary target selection bitmask for SV2
SV3_BGS_TARGET	int64		BGS (bright time program) target selection bitmask for SV3
SV3_DESI_TARGET	int64		DESI (dark time program) target selection bitmask for SV3
SV3_MWS_TARGET	int64		MWS (bright time program) target selection bitmask for SV3
SV3_SCND_TARGET	int64		Secondary target selection bitmask for SV3
SV_NSPEC	int32		Number of coadded spectra for this TARGETID in SV (SV1+2+3)
SV_PRIMARY	bool		Boolean flag (True/False) for the primary coadded spectrum in SV (SV1+2+3)
TARGETID	int64		Unique DESI target ID
TARGET_DEC	float64	deg	Barycentric declination in ICRS
TARGET_RA	float64	deg	Barycentric right ascension in ICRS
TARGET_STATE	char[*]		Combination of target class and its current observational state
TILEDEC	float64	deg	Barycentric declination of tile center in ICRS
TILEID	int32		Unique DESI tile ID
TILELOCID	int64		Is 10000*TILEID+LOCATION
TILELOCIDS	char[*]		TILELOCIDs that the target was available for, separated by ‘-’
TILELOCID_ASSIGNED	int64		0/1 for unassigned/assigned for TILELOCID in question (it could have been assigned to a different target)
TILERA	float64	deg	Barycentric Right Ascension of tile center in ICRS
TILES	char[*]		TILEIDs of those tile, in string form separated by ‘-’
TIMESTAMP	str	s	UTC/ISO time at which the target state was updated
TOOID	int64		ID for this target assigned by the CHECKER
TOO_PRIO	char[2]		Either ‘HI’ for a very-high-priority target or ‘LO’ for a very-low-priority target
TOO_TYPE	char[5]		Either ‘TILE’ for a special tile or ‘FIBER’ for a fiber-override ToO
TSNR2_BGS	float32		BGS template (S/N)^2 summed over B,R,Z
TSNR2_BGS_B	float32		BGS B template (S/N)^2
TSNR2_BGS_R	float32		BGS R template (S/N)^2
TSNR2_BGS_Z	float32		BGS Z template (S/N)^2
TSNR2_ELG	float32		ELG template (S/N)^2 summed over B,R,Z
TSNR2_ELG_B	float32		ELG B template (S/N)^2
TSNR2_ELG_R	float32		ELG R template (S/N)^2
TSNR2_ELG_Z	float32		ELG Z template (S/N)^2
TSNR2_GPBBACKUP	float64		template (S/N)^2 for backup targets in guider pass band
TSNR2_GPBBACKUP_B	float64		template (S/N)^2 for backup targets in guider pass band on B
TSNR2_GPBBACKUP_R	float64		template (S/N)^2 for backup targets in guider pass band on R
TSNR2_GPBBACKUP_Z	float64		template (S/N)^2 for backup targets in guider pass band on Z
TSNR2_GPBBRIGHT	float64		template (S/N)^2 for bright targets in guider pass band
TSNR2_GPBBRIGHT_B	float64		template (S/N)^2 for bright targets in guider pass band on B
TSNR2_GPBBRIGHT_R	float64		template (S/N)^2 for bright targets in guider pass band on R
TSNR2_GPBBRIGHT_Z	float64		template (S/N)^2 for bright targets in guider pass band on Z
TSNR2_GPBDARK	float64		template (S/N)^2 for dark targets in guider pass band
TSNR2_GPBDARK_B	float64		template (S/N)^2 for dark targets in guider pass band on B
TSNR2_GPBDARK_R	float64		template (S/N)^2 for dark targets in guider pass band on R
TSNR2_GPBDARK_Z	float64		template (S/N)^2 for dark targets in guider pass band on Z
TSNR2_LRG	float32		LRG template (S/N)^2 summed over B,R,Z
TSNR2_LRG_B	float32		LRG B template (S/N)^2
TSNR2_LRG_R	float32		LRG R template (S/N)^2
TSNR2_LRG_Z	float32		LRG Z template (S/N)^2
TSNR2_LYA	float32		LYA template (S/N)^2 summed over B,R,Z
TSNR2_LYA_B	float32		LYA B template (S/N)^2
TSNR2_LYA_R	float32		LYA R template (S/N)^2
TSNR2_LYA_Z	float32		LYA Z template (S/N)^2
TSNR2_QSO	float32		QSO template (S/N)^2 summed over B,R,Z
TSNR2_QSO_B	float32		QSO B template (S/N)^2
TSNR2_QSO_R	float32		QSO R template (S/N)^2
TSNR2_QSO_Z	float32		QSO Z template (S/N)^2
TYPE	char[4]		Morphological Model type from Tractor; renamed MORPHTYPE in most files
URAT_ID	int64		ID in the URAT catalog for sources where URAT supplemented missing Gaia astrometric information
URAT_SEP	float32	arcsec	Separation between URAT and Gaia sources where URAT supplemented missing Gaia astrometric information
VAR_A_MGII	float32		Variance of MgII fit amplitude parameter A
VAR_B_MGII	float32		Variance of MgII fit offset parameter B
VAR_SIGMA_MGII	float32		Variance of MgII fit width parameter sigma
VERSION	char[14]		Tag of desitarget used to create the target catalog
WEIGHT	float64		The combination of all weights to use
WEIGHT_COMP	float64		1/FRACZ_TILELOCID
WEIGHT_FKP	float64		1/(1+NZ*P0), with P0 different for each tracer
WEIGHT_SYS	float64		Correction for fluctuations in projected density with imaging conditions, from random forrest method
WEIGHT_SYSEB	float64		Correction for fluctuations in projected density with imaging conditions, from linear regression method applied to eBOSS
WEIGHT_ZFAIL	float64		Should be all 1 at this point for main survey
WISEMASK_W1	byte		Bitwise mask for WISE W1 data
WISEMASK_W2	byte		Bitwise mask for WISE W2 data
Z	float64		Redshift measured by Redrock
ZCAT_NSPEC	int32		Number of times this TARGETID appears in this catalog
ZCAT_PRIMARY	bool		Boolean flag (True/False) for the primary coadded spectrum in this zcatalog
ZERR	float64		Redshift error from redrock
ZPOSSLOC	bool		True/False whether the location could have been assigned to the given target class
ZTILEID	int32		ID of tile that most recently updated target’s state
ZWARN	int64		Redshift warning bitmask from Redrock
ZWARN_MTL	int64		The ZWARN from the zmtl file (contains extra bits)
Z_CIII	float64		Redshift estimated by QuasarNET with CIII line
Z_CIV	float64		Redshift estimated by QuasarNET with CIV line
Z_Halpha	float64		Redshift estimated by QuasarNET with Halpha line
Z_Hbeta	float64		Redshift estimated by QuasarNET with Hbeta line
Z_HP	float64		Redshift from Healpix coadd
Z_LYA	float64		Redshift estimated by QuasarNET with LyA line
Z_MgII	float64		Redshift estimated by QuasarNET with MgII line
Z_QN	float64		Redshift measured by QuasarNET using line with highest confidence
Z_QN_CONF	float64		Redshift confidence from QuasarNET
Z_RR	float64		Redshift collected from redrock file