"len2-hist.txt" with lp lt 1 title "2 byte messages", \\
"len4-hist.txt" with lp lt 2 title "4 byte messages", \\
"len6-hist.txt" with lp lt 3 title "6 byte messages", \\
"len2-hist.txt" with lp lt 1 title "2 byte messages", \\
"len4-hist.txt" with lp lt 2 title "4 byte messages", \\
"len6-hist.txt" with lp lt 3 title "6 byte messages", \\