# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'sharpen.1.png'
set grid nopolar
set grid xtics nomxtics noytics nomytics noztics nomztics nortics nomrtics \
 nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics
set grid layerdefault   lt 0 linecolor 0 linewidth 0.500,  lt 0 linecolor 0 linewidth 0.500
set key title "lgamma(x)" enhanced   center
set key fixed right center vertical Right noreverse enhanced autotitle nobox
set key noinvert samplen 0 spacing 1 width 0 height 0
set samples 300, 300
set style data lines
set xtics  norangelimit 1 
set xrange [ -10.0000 : 2.00000 ] noreverse
set yrange [ -15.0000 : 5.00000 ] noreverse
NO_ANIMATION = 1
## Last plot was a multiplot
# saved multiplot
set multiplot layout 2,1 title "Effect of 'sharpen' filter"
plot lgamma(x) title "no filters"
if (GPVAL_VERSION >= 6.0) {;    plot lgamma(x) sharpen title "  sharpen";} else {;    set label 1 center at graph 0.5, 0.5 "This copy of gnuplot does not support 'sharpen'";    unset key; plot NaN;}
unset multiplot