"hist.dat" with lp lt 1 title "No modifications", \
"hist-mod.dat" with lp lt 2 title "Two modifications", \
"hist-mod2.dat" with lp lt 3 title "Four modifications", \
"hist.dat" with lp lt 1 title "No modifications", \
"hist-mod.dat" with lp lt 2 title "Two modifications", \
"hist-mod2.dat" with lp lt 3 title "Four modifications", \