@@ -7,13 +7,20 @@ spectroscopic exposures use the three reference files :ref:`fflat_reffile` (fore
77
88.. include :: ../references_general/flat_reffile.inc
99
10+ .. _flat_ref_nirspec_spec :
11+
1012Reference Files for NIRSpec Spectroscopy
1113========================================
1214For NIRSpec spectroscopic data, the flat-field reference files allow for variations in
1315the flat field with wavelength, as well as from pixel to pixel. There is a
1416separate flat-field reference file for each of three sections of the
15- instrument: the fore optics (FFLAT), the spectrograph (SFLAT), and the
16- detector (DFLAT). The contents of the reference files differ from one mode
17+ instrument:
18+
19+ * the fore optics (:ref: `fflat_reffile `)
20+ * the spectrograph (:ref: `sflat_reffile `)
21+ * the detector (:ref: `dflat_reffile `)
22+
23+ The contents of the reference files differ from one mode
1724to another (see below), but in general they may contain a flat-field image and
1825a 1-D array. The image provides pixel-to-pixel values for the flat field
1926that may vary slowly (or not at all) with wavelength, while the 1-D array
@@ -45,8 +52,8 @@ there are different flat fields for fixed-slit data, IFU data, and for
4552multi-object spectroscopic data. Here is a summary of the contents of these
4653files.
4754
48- For the fore optics (FFLAT ), the flat field for fixed-slit data contains just a
49- FAST_VARIATION table (i.e. there is no image). This table has five rows,
55+ For the fore optics (:ref: ` fflat_reffile ` ), the flat field for fixed-slit data contains just a
56+ FAST_VARIATION table (i.e., there is no image). This table has five rows,
5057one for each of the fixed slits. The FFLAT for IFU data also contains
5158just a FAST_VARIATION table, but it has only one row with the value "ANY"
5259in the "slit_name" column. For multi-object spectroscopic data, the FFLAT
@@ -57,22 +64,18 @@ than to detector pixels. The array size is 365 columns by 171 rows,
5764and there are multiple planes to handle the slow variation
5865of flat field with wavelength.
5966
60- For the spectrograph optics (SFLAT ), the flat-field files have nearly the same
67+ For the spectrograph optics (:ref: ` sflat_reffile ` ), the flat-field files have nearly the same
6168format for fixed-slit data, IFU, and multi-object data. The difference is
6269that for fixed-slit and IFU data, the image is just a single plane,
63- i.e. the only variation with wavelength is in the FAST_VARIATION table,
70+ i.e., the only variation with wavelength is in the FAST_VARIATION table,
6471while there are multiple planes in the image for multi-object spectroscopic
6572data (and therefore there is also a corresponding WAVELENGTH table, with
6673one row for each plane of the image).
6774
68- For the detector section, the DFLAT file contains a 3-D image
69- (i.e. the flat field at multiple wavelengths), a corresponding
75+ For the detector section, the :ref: ` dflat_reffile ` contains a 3-D image
76+ (i.e., the flat field at multiple wavelengths), a corresponding
7077WAVELENGTH table, and a FAST_VARIATION table with one row.
7178
72- As just described, there are 3 types of reference files for NIRSpec (FFLAT,
73- SFLAT, and DFLAT), and within each of these types, there are several formats,
74- which are now described.
75-
7679.. include :: ../references_general/fflat_reffile.inc
7780
7881.. include :: ../references_general/sflat_reffile.inc
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