The following describes the most significant changes which
occurred in the AST library between versions V7.1.0 and V7.1.1:
- When a FitsChanFitsChan is used to write an “offset” SkyFrameSkyFrame (see attribute
SkyRefIsSkyRefIs) to a FITS-WCS encoded header, two alternate axis descriptions
are now created - one for the offset coordinates and one for the absolute
coordinates. If such a header is subsequently read back into AST, the
original offset SkyFrame is recreated.
- A bug has been fixed in FitsChan that caused inappropriate CTYPE values
to be generated when writing a FrameSetFrameSet to FITS-WCS headers if the
current FrameFrame describes generalised spherical coordinates (i.e. a
SkyFrame with SystemSystem=Unknown).