# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'simple.4.png'
set key inside left top vertical Right noreverse enhanced autotitles box linetype -1 linewidth 1.000
set samples 200, 200
set title "Simple Plots" 
set title  offset character 0, 0, 0 font ",20" norotate
plot [-30:20] besj0(x)*0.12e1 with impulses, (x**besj0(x))-2.5 with points