## Position section

The position section is described in the Table . Note that the source position is described as the offsets between the actual (reconstructed) position (RA or longitude, DEC or latitude) and the nominal (commanded) position (RA_NOM, DEC_NOM). This also means that for Solar System Objects (SSO), the offsets are not expressed in the comoving frame, but from a fixed position on sky.

Table: Look-up table between the CLASS Position 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.
CLASS | Type | Value | Default
sourc | C*12 | Card OBJECT | UNKNOWN
system | I*4 | CLASS internal code for Equatorial system |
equinox | R*4 | Card EQUINOX | Error
proj | I*4 | CLASS internal code for Radio projection |
lam | R*8 | Card RA_NOM | Error
bet | R*8 | Card DEC_NOM | Error
projang | R*8 | 0.d0 |
lamof | R*4 | Offset in current projection between card RA_NOM and | 0, i.e. actual position
|  | card RA (level 2.5) or column longitude (level 2.0) | defaults to nominal
betof | R*4 | Offset in current projection between card DEC_NOM and | 0, i.e. actual position
|  | card DEC (level 2.5) or column latitude (level 2.0) | defaults to nominal