# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'simple.1.png'
set key left top Right noreverse noinvert enhanced box linetype -1 linewidth 1.000 samplen 4 spacing 1 width 0 height 0 autotitles
set samples 50, 50
plot [-10:10] sin(x),atan(x),cos(atan(x))