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Description: 
 This function returns the current value of the ActiveUnit
flag for a 
Frame. See the description of the 
astSetActiveUnit function for a
description of the ActiveUnit flag.  
Synopsis 
 int astGetActiveUnit( AstFrame
this )
 Parameters: 
  this  
 Pointer to the Frame.  
    Returned Value 
  astGetActiveUnit  
 The
current value of the ActiveUnit flag.  
    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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