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Description: 
 This function returns a 
Mapping in which the
forward transformation transforms a position in the coordinate system given
by the 
System attribute of the supplied 
SkyFrame, into the offset coordinate
system specified by the SkyRef, SkyRefP and 
SkyRefIs attributes of the supplied
SkyFrame.
A UnitMap is returned if the SkyFrame does not define an offset coordinate system.  
Synopsis 
 AstMapping
astSkyOffsetMap(
AstSkyFrame this
)  
 Parameters: 
  this  
 Pointer to the SkyFrame.  
    Returned Value 
  astSkyOffsetMap()  
Pointer to the returned Mapping.  
    Notes: 
 Copyright (C) 2021 East Asian Observatory
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 A Library for Handling
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Coordinate Systems
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