On Fri 2003/10/24 11:55:37 MST, Stephen Walton wrote
in a message to: Mark Calabretta
and copied to:

CD matrix format, though, may I politely request that Bill and/or your
routines support the CD and PC matrices?

WCSLIB already does, as of version 3.0, and also recognizes CROTAn
in old header files. Likewise for the new parsing routine that I
mentioned (when it eventually appears).

Just for completeness... the AST library (www.starlink.ac.uk/ast/) also
handles CD (both CDi_j and CDiiijjj) and PC matrices (both PCi_j and
PCiiijjj), and includes a parsing system (i.e. you give it an entire
header, and it sucks out the bits it needs and gives you a pointer to
an object representing all the WCS information in the header).

David