-plot [0:] [1:$COUNT] \
- "hist-0.dat" with lp lt 1 title "Message id 0", \
- "hist-20.dat" with lp lt 2 title "Message id 20", \
- "hist-40.dat" with lp lt 3 title "Message id 40", \
- "hist-60.dat" with lp lt 4 title "Message id 60", \
- "hist-80.dat" with lp lt 5 title "Message id 80", \
- "hist-100.dat" with lp lt 6 title "Message id 100", \
- "hist-120.dat" with lp lt 7 title "Message id 120"