Keywords: class

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### From CLASS to FITS

To write a FITS file from CLASS data, use the following command:

       FITS WRITE Filename[.fits] [/BITS Nbits] [/MODE SPECTRUM|INDEX]

The command will create a simple FITS file from the current Spectrum (in `SPECTRUM` mode), or a FITS BINTABLE from the current Index (in `INDEX` mode). The number of bits can be controlled. Default values for the mode and the number of bits can be supplied by the `SET FITS` command.

        SET FITS BITS Nbits
        SET FITS MODE Spectrum|Index|None

In `INDEX` mode, it is up to the user to make sure that the index is consistent (same number of channels, etc..., for all spectra in index).