=====================
pix-CAMERA-EXPID.fits
=====================

:Summary: Pre-processed CCD pixel data.
:Naming Convention: ``pix-{CAMERA}-{EXPID}.fits``, where {CAMERA} is the camera name
    (*e.g.* ``b0``, ``r1``, or ``z9``), and ``{EXPID}`` is the 8-digit exposure ID.
:Regex: ``pix-[brz]{1}[0-9]{1}-[0-9]{8}\.fits``
:File Type: FITS, 320 MB

Contents
========

====== ========= ===== ================================
Number EXTNAME   Type  Contents
====== ========= ===== ================================
HDU0_  ELECTRONS IMAGE Pre-processed electrons
HDU1_  IVAR      IMAGE Inverse variance [1/electrons^2]
HDU2_  MASK      IMAGE Mask 0=good, non-0 is bad
====== ========= ===== ================================


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

.. _HDU0:

HDU0 - ELECTRONS
----------------

EXTNAME = ELECTRONS

Bias subtracted, pixel flat fielded, gain corrected CCD image in electrons.

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

.. collapse:: Required Header Keywords Table

    .. rst-class:: keywords

    ======== ============= ===== ==================================
    KEY      Example Value Type  Comment
    ======== ============= ===== ==================================
    CAMERA   b0            str   Spectograph Camera
    VSPECTER 0.0.0         str   TODO: Specter version
    EXPTIME  1000.0        float Exposure time [sec]
    RDNOISE  3.0           float Read noise [electrons]
    FLAVOR   arc           str   Exposure type (arc, flat, science)
    ======== ============= ===== ==================================

Data: FITS image

.. _HDU1:

HDU1 - IVAR
-----------

EXTNAME = IVAR

Inverse variance image of the electron image in HDU 0

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

.. collapse:: Required Header Keywords Table

    .. rst-class:: keywords

    ======= ======== ===== ======================
    KEY     Value    Type  Comment
    ======= ======== ===== ======================
    EXTNAME IVAR     str   extension name
    RDNOISE 3.0      float Read noise [electrons]
    ======= ======== ===== ======================

Data: FITS image

HDU2
----

EXTNAME = MASK

Mask image, where 0=good, non-0=bad.

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

.. collapse:: Required Header Keywords Table

    .. rst-class:: keywords

    ======= ======== ==== ==============
    KEY     Value    Type Comment
    ======= ======== ==== ==============
    EXTNAME MASK     str  extension name
    ======= ======== ==== ==============

Data: FITS image