============================
zall-pix-SPECPROD-extra.fits
============================

:Summary: Concatenation of all ``zpix-*-extra.fits`` files, combining all
          extra columns across all SURVEYs and PROGRAMs.
:Naming Convention: ``zcatalog/v2/zall/zall-pix-{SPECPROD}-extra.fits``, where ``{SPECPROD}``
    is the official name of the full reduction, *e.g.* ``iron``.
:Regex: ``zall-pix-[a-z0-9_-]+-extra\.fits``
:File Type: FITS, ~25 GB

This file is row-matched to :doc:`zall-pix-SPECPROD.fits <./zall-pix-SPECPROD>`
and contains the extra columns stacked from all
:doc:`zpix-*-extra.fits <../SURVEY/zpix-SURVEY-PROGRAM-extra>` files.

Contents
========

====== =============== ======== ============================================================
Number EXTNAME         Type     Contents
====== =============== ======== ============================================================
HDU0_  PRIMARY         IMAGE    Empty
HDU1_  ZCATALOG_EXTRA  BINTABLE All extra columns not in core or imaging files
====== =============== ======== ============================================================


FITS Header Units
=================

HDU0
----

EXTNAME = PRIMARY

Required Header Keywords
~~~~~~~~~~~~~~~~~~~~~~~~

.. collapse:: Required Header Keywords Table

    .. rst-class:: keywords

    ============ ================ ==== =======================
    KEY          Example Value    Type Comment
    ============ ================ ==== =======================
    CHECKSUM     9aaGCVYE9aaECUYE str  HDU checksum
    DATASUM      0                str  data unit checksum
    ZCATVER      v2               str  Version of zcatalog files
    ============ ================ ==== =======================

Empty HDU.

HDU1
----

EXTNAME = ZCATALOG_EXTRA

All extra columns stacked from all
:doc:`zpix-SURVEY-PROGRAM-extra.fits <../SURVEY/zpix-SURVEY-PROGRAM-extra>` files.
Column definitions are identical to that file; see it for full descriptions.

Required Header Keywords
~~~~~~~~~~~~~~~~~~~~~~~~

.. collapse:: Required Header Keywords Table

    .. rst-class:: keywords

    ============ ================ ==== =======================
    KEY          Example Value    Type Comment
    ============ ================ ==== =======================
    NAXIS1       870              int  width of table in bytes
    NAXIS2       3000000          int  number of rows in table
    CHECKSUM     QA6lQ26iQ96iQ96i str  HDU checksum
    DATASUM      4284326946       str  data unit checksum
    ZCATVER      v2               str  Version of zcatalog files
    ============ ================ ==== =======================

Required Data Table Columns
~~~~~~~~~~~~~~~~~~~~~~~~~~~

See :doc:`zpix-SURVEY-PROGRAM-extra.fits <../SURVEY/zpix-SURVEY-PROGRAM-extra>` for the
full column list. The zall-pix-extra file contains the same columns as the
per-survey zpix-extra files, with rows stacked from all surveys and programs.