# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'steps.1.png'
set title "Compare steps, fsteps and histeps" 
plot [0:12][0:13] "steps.dat" notitle with points,   "steps.dat" title 'steps' with steps,  'steps.dat' title 'fsteps' with fsteps,  'steps.dat' title 'histeps' with histeps