# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 
# set output 'fillcrvs.3.png'
set tics front
set grid nopolar
set grid xtics nomxtics ytics nomytics noztics nomztics \
 nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics
set grid front   linetype 0 linewidth 1.000,  linetype 0 linewidth 1.000
set key outside right top vertical Right noreverse enhanced autotitles nobox
set title "Filled sinus and cosinus curves" 
plot 2+sin(x)**2 with filledcurve x1, cos(x)**2 with filledcurve x1