This attribute
gives the indices of the longitude and latitude coordinates of the FITS-WCS
projection within the coordinate space used by a
WcsMap. These indices are defined
when the WcsMap is first created using
astWcsMap and cannot subsequently be
altered.
If "
lonlat"
is 1, the index of the longitude axis is returned. Otherwise, if it is 2,
the index of the latitude axis is returned.