This attribute provides aliases for the PV attributes, which
specifies the projection parameter values to be used by a WcsMapWcsMap
when implementing a FITS-WCS sky projection. ProjP is retained for
compatibility with previous versions of FITS-WCS and AST. New
applications should use the PV attibute instead.
Attributes ProjP(0) to ProjP(9) correspond to attributes PV
axlat
_0
to PV
axlat
_9, where
axlat
is replaced by the index of the
latitude axis (given by attribute WcsAxis(2)). See PV for further
details.