Reference File Types

The extract_2d step uses the following reference files:

reftype	description	Instrument
wavecorr	NIRSPEC wavelength zero-point correction	NIRSPEC

CRDS Selection Criteria For Each Reference File Type

WAVECORR

The WAVECORR reference file is selected based on EXP_TYPE of the science data. The reference file s relevant only for Nirspec observations with EXP_TYPE of NRS_FIXEDSLIT, NRS_MSASPEC, NRS_BRIGHTOBJ.

Reference File Formats For Each Reference File Type

WAVECORR

The WAVECORR file contains reference data about the NIRSPEC wavelength zero-point correction. The reference data is described in the NIRSPEC Technical Note ESA-JWST–SCI-NRS-TN-2016-018.

apertures:

aperture_name:

Aperture name. :variance: Estimated variance on the zero-point offset. :width: Aperture width [SLIT] or pitch [MOS]. :zero_point_offset: Zero-point offset as a function of wavelength (in m)

and source offset within the aperture (in units of fraction of the aperture width [SLIT] or pitch [MOS]).