The EXTENDED_SOURCE recipe is used to reduce observations of extended sources. It differs from POINT_SOURCE in that EXTENDED_SOURCE skips spectrum extraction and proceeds directly with signal-to-noise calculation and division by a standard star .
The following variants are available: EXTENDED_SOURCE_NOARC (no arc spectrum extracted), EXTENDED_SOURCE_NOFLAT (no division by a flat-field), EXTENDED_SOURCE_NOFLAT_NOARC, EXTENDED_SOURCE_NOFLAT_NOSTD, and EXTENDED_SOURCE_NOSTD.
ORAC-DR -- spectroscopy data reduction