Keywords: point

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## Optical versus Radio

The types of data files treated by POINT differ slightly. For Optical data, the pointing error is relative to a perfect antenna. Hence the `POINTPRINT` output directly indicates the new pointing parameter values. For Radio (or Interferometer) data, however, the pointing error is relative to the previous model, except for the collimations. Hence `POINTPRINT` yields directly `COH` and `COV`, but for all other parameters the POINT results should be added to the previous values.

In particular, the Radio results can be used in the OBS `SETPOINTING` command in an incremental way:

         SET\POINTING IAZ IAZ+dIaz IEL IEL+dIel/ANTENNA 2

where `dIaz, dIel` are the results given by command `POINTPRINT` for the parameters `IAZ, IEL`.