# set terminal svg size 600,400 dynamic enhanced fname 'arial'  fsize 10 mousing name "simple_8" butt solid 
# set output 'simple.8.svg'
set key bmargin left horizontal Right noreverse enhanced autotitles box linetype -1 linewidth 1.000
set samples 800, 800
plot [-19:19] '1.dat'with impulses ,'2.dat' ,'3.dat' with lines