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<H2><A NAME="SECTION000294000000000000000">
Paper IV - Coordinate Distortions</A>
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<P>
This paper proposes that an additional 4 character code be appended to
the end of the CTYPE<SPAN CLASS="textit">i</SPAN> keyword to specify the nature of any
distortion away from the basic algorithm described by the first 8
characters of the CTYPE<SPAN CLASS="textit">i</SPAN> value. Currently AST ignores all such
codes when reading a FrameSetFrameSet from a FitsChanFitsChan (except for the ``-SIP'' code
defined by the Spitzer Space Telescope project - see below). This means that
a FrameSet can still be read from such headers, but the MappingMapping which gives
the WCS position associated with a given pixel position will reflect only
the basic algorithm and will not include the effects of the distortion.
<P>
If such a FrameSet is then written out to a FitsChan, the resulting
CTYPE<SPAN CLASS="textit">i</SPAN> keywords will include no distortion code.
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