Keywords: class-herschel-fits

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## 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

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