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...Test if a WCS is a Spectral Coordinate System
Testing for a spectral coordinate system is basically the same as testing
for a celestial coordinate system (see the previous section). The one
difference is that you use the
astIsASpecFrame function
in place of the
astIsASkyFrame function.
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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
Copyright (C) 2009 Science \& Technology Facilities Council