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Look-up tables

We describe here, section by section, how the CLASS observation header is filled from the Herschel-HIFI FITS header and data. You can refer to the CLASS or Herschel-HIFI documentations for the exact specification of each component. The concept of FITS cards and metacards is explained in the section [*].





Table: Look-up table between the CLASS General section and the Herschel-HIFI FITS. Depending on the FITS structure (pipeline level), some elements found in a FITS header or in a FITS binary table. FITS names are case sensitive. The elements not described here are set to their usual undefined value in CLASS.
Name Type Value Default
num I*8 Automatic
ver I*4 1
teles C*12 HIF-LL-SP-BB where:
- LL is 00 (level 2.5) or the subband number in the column flux_*
name (level 2.0), 00
- S is the spectrometer, W for WBS or H for HRS (1st letter of the
card BACKEND, else of the metacard polarization) Blank
- P is the polarization, V or H (5th letter of the card BACKEND, else
of the metacard polarization) Blank
- BB is the band name (2 first letters of the card BAND) Blank
dobs I*4 Integer part of average of card DATE-OBS and card DATE-END Current day
dred I*4 Current day
kind I*4 CLASS internal code for spectroscopic data
qual I*4 CLASS internal code for unknown quality
scan I*8 Metacard bbtype (level 2.5) or column bbtype (level 2.0) 0
subscan I*4 Metacard bbnumber (level 2.5) or column bbnumber (level 2.0) 0
ut R*8 Fractional part of average of card DATE-OBS and card DATE-END Current time
tau R*4 0.0
tsys R*4 Metacard tsys_median (level 2.5) or column tsys_median (level 2.0) 0 K
time R*4 Metacard integrationTime (level 2.5) or
column integrationTime (level 2.0) 0 sec



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Gildas manager 2023-06-01