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README file: <RSI_Directory>
	       <IDL_Directory>
		  help
		    copyrights
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   The following software is used by IDL under the terms of the
GNU Library Public License (found in the file gnu_library_license.txt
in this directory):

    The Mesa 3-D Graphics Library
	All versions of IDL (except under Windows 95 and Windows NT)
	use the Mesa 3-D graphics library. Mesa is a software-only
        implementation the Open GL API. Please see the file mesa.txt
	in this directory for additional information.