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The command LAS
FITS traverses one by one all the
HDUs in the FITS file independently of their names. If a binary
table is found and:
- if it contains a column frequency or wave, it is
assumed to be a level 2.5 Herschel-HIFI FITS and the specific decoding is
started.
- if if contains at least one column lsbfrequency_* or usbfrequency_*, it is assumed be a level 2.0 Herschel-HIFI FITS and the
specific decoding is started.
The levels 2.0 and 2.5 refer to the reduction pipeline level in
HCSS. The resulting FITS provides (almost) the same data but under a
different form. For our needs, the main differences come from values
which are found in columns of the binary table in level 2.0, and in
metacards (see below) of the header in level 2.5.
Gildas manager
2023-06-01