# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'simple.8.png'
set key bmargin left horizontal Right noreverse enhanced autotitles box linetype -1 linewidth 1.000
set samples 800, 800
set title "Simple Plots" 
set title  offset character 0, 0, 0 font ",20" norotate
plot [-19:19] '1.dat'with impulses ,'2.dat' ,'3.dat' with lines