Keywords: class-herschel-fits

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## Detecting an Herschel-HIFI FITS

A FITS file fed as input of the command `LASFITS` is assumed to be an Herschel-HIFI FITS if the Primary HDU:

1. contains the card `HCSS____`, and
2. the value of the card `TYPE` is not `HICLASS` nor ``Class formatted fits file'`.

The 2nd rule discriminates Herschel-HIFI FITS and CLASS FITS produced by `HICLASS`.