spectra

Starting with the Matterhorn production (test run for DR3), spectra are grouped by spectra/SURVEY/PROGRAM/PIXGROUP/UNIQPIX, where UNIQPIX = HEALPIX + 4*NSIDE^2 is an adaptively sized healpixel identifier used to balance the number of targets per file.

For current public releases, see the healpix directory tree which uses fixed-size nside=64 healpixels.

• SURVEY