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DCL:GRPH1:SWPACK: Machine-Dependent Routines:Varioous Databases

7.9.2 Color/Tone Index Conversion Table

When filling polygons with solid colors (using tone pattern index with 999 as the last 3 digits), the color index is converted into pattern index for dot patterns using this conversion table when the output device cannot handle color (or when the internal variable 'LCL2TN' handled by  sgpget/sgpset is set to .true. ) This must be present as a file indicated by the internal variable  'CL2TN'.

This data file is not directly used in SWPACK. Instead, it is accessed by szcltn  in SZPACK. The file name is searched by swqfnm. This data is read when the tone primitive is first called, and is not accessed after that.