These conventions are used when reading a FrameSetFrameSet
from a FitsChanFitsChan which includes appropriate
CTYPEi values, and when writing a FrameSet in which
the WCS FrameFrame is a SpecFrameSpecFrame.
TableTable 3 describes the use made by AST of each keyword
whose meaning is defined or extended by FITS-WCS paper III.
Table 3:
Use of FITS-WCS Paper III keywords
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