Reference File
==============
For most modes, the ``extract_1d`` step uses an EXTRACT1D reference file and an
APCORR reference file.  For optimal extraction, it additionally uses a PSF
reference file.

.. include:: ../references_general/extract1d_reffile.inc
.. include:: ../references_general/apcorr_reffile.inc
.. include:: ../references_general/psf_reffile.inc