Sets the location for new IRA astrometry structures IRA_LOCAT
"
ASTROMETRY"
within the "
IRAS"
NDF extension. These names may be changed if necessary by
calling this routine. The supplied arguments give the name of the NDF extension and the
component name to be used by all future calls to IRA_CREAT or IRA_EXPRT. It should be
ensured that the extension exists before calling IRA_CREAT or IRA_EXPRT.