## Aitoff projection

GILDAS implements the AIT projection only for ; non-zero reference declinations are always ignored when projecting or unprojecting positions, even if the data format usually saves any declination value. This implementation is compatible7 with the AIPS (and thus the CG02) convention in the case.

Note, however, that when data were exported to FITS files, GILDAS versions earlier than aug23 were using the possibly non-zero declinations as the CRVAL2 value. This is incorrect and was leading to wrong interpretation of the maps by third-party software. This is fixed in the aug23 release by always setting CRVAL2 parameter to 0 for the AIT projection.

If, at some point, the non-zero declination case is to be implemented in GILDAS, we should choose the newest formalism, i.e. the CG02 one8