# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'simple.9.png'
set key bmargin left horizontal Right noreverse enhanced autotitles box linetype -1 linewidth 1.000
set samples 800, 800
f(x) = x/100
plot [-19:19] '1.dat'with impulses ,'2.dat' thru f(x) ,'3.dat' with lines