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PS_create_file

# Arguments: $PSfilename   : name of graph output file
#            $scale_factor : scale factor for graph
#            $xpages       : x dimension of image in pages
#            $ypages       : y dimension of image in pages
#            
# Return Values: None
# Description: Outputs page blocks for all valid (x,y) coordinates, outputs
#              the necessary closing PS-DSC gunk, then closes the file handle.