#!/usr/local/bin/gnuplot -persist
# set terminal pngcairo  transparent enhanced font "arial,8" fontscale 1.0 size 512, 280 
# set output 'transparent.4.png'
set style fill  transparent pattern 4 border
set key title "Gaussian Distribution" center
set key fixed left top vertical Left reverse enhanced autotitle nobox
set key noinvert samplen 1 spacing 1 width 0 height 0
unset parametric
set style data lines
set style function filledcurves y1=0
set title "Transparent pattern-filled curves" 
set xrange [ -5.00000 : 5.00000 ] noreverse nowriteback
set x2range [ * : * ] noreverse writeback
set yrange [ 0.00000 : 1.00000 ] noreverse nowriteback
set y2range [ * : * ] noreverse writeback
set zrange [ * : * ] noreverse writeback
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
set colorbox vertical origin screen 0.9, 0.2 size screen 0.05, 0.6 front  noinvert bdefault
unset colorbox
Gauss(x,mu,sigma) = 1./(sigma*sqrt(2*pi)) * exp( -(x-mu)**2 / (2*sigma**2) )
d1(x) = Gauss(x, 0.5, 0.5)
d2(x) = Gauss(x,  2.,  1.)
d3(x) = Gauss(x, -1.,  2.)
NO_ANIMATION = 1
save_encoding = "utf8"
plot d1(x) fs solid 1.0 lc rgb "forest-green" title "μ =  0.5 σ = 0.5",      d2(x) lc rgb "gold" title "μ =  2.0 σ = 1.0",      d3(x) lc rgb "dark-violet" title "μ = -1.0 σ = 2.0"