At Rene's suggestion, I have plotted Rayman's counts of distinct characters per page: cat rayman-char-counts.txt | tr ',' ' ' > .tmp gnuplot <<EOF set term pbm color set output "rayman-char-counts.ppm" set xrange [0:500] set xlabel "total chars" set yrange [0:40] set ylabel "distinct chars" plot ".tmp" \ using 2:3 title "f1r--f51v" with points quit EOF ppmtogif < rayman-char-counts.ppm > rayman-char-counts.gif xv rayman-char-counts.{ppm,gif}