# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'uigamma.2.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
unset key
set pointsize 0.5
set title "Upper incomplete gamma function:     uigamma(23,x)" 
set title  offset character 0, -7.5, 0 font "" textcolor lt -1 norotate
set xrange [ 83.0000 : 89.0000 ] noreverse
set yrange [ * : * ] reverse
NO_ANIMATION = 1
save_encoding = "utf8"
## Last plot was a multiplot
# saved multiplot
set multiplot layout 2,1 upwards margins 0.25, 0.95, 0.1, 0.95 spacing 0, screen .10
set xrange [83. : 89.]
set yrange [1. - 2.e-15 : 1.0]
set format y "%.16f"
set title "Lower incomplete gamma function:     igamma(23, x)\n(low precision in this range)"
plot igamma(23., x) with points notitle
set format y " %h"
set auto y
set yrange reverse
set title "Upper incomplete gamma function:     uigamma(23,x)"
plot uigamma(23., x) with points notitle

unset multiplot