plot [$range] [1:$COUNT] \\
"len2-hist.txt" with lp lc 1 lt 1 title "PC: 2 byte messages", \\
"len4-hist.txt" with lp lc 2 lt 1 title "PC: 4 byte messages", \\
plot [$range] [1:$COUNT] \\
"len2-hist.txt" with lp lc 1 lt 1 title "PC: 2 byte messages", \\
"len4-hist.txt" with lp lc 2 lt 1 title "PC: 4 byte messages", \\