The SkyFrame class re-defines the default Label value
(e.g. to "Right ascension" or "Galactic latitude") as
appropriate for the particular celestial coordinate system
being represented.
AST A Library for Handling World Coordinate Systems in Astronomy Starlink User Note 211 R.F. Warren-Smith & D.S. Berry 24th May 2011 E-mail:ussc@star.rl.ac.uk
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