# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'pointsize.2.png'
unset border
unset key
set view map scale 1
set style data lines
unset xtics
unset ytics
unset ztics
set title "splot with variable size points\nit is possible to specify size and color separately" 
NO_ANIMATION = 1
## Last datafile plotted: "world.cor"
splot 'world.dat' using 1:2:(0) with lines lt 3,       'world.cor' using 1:2:(0.5-rand(0)):(5.*rand(0)) with points pt 5 ps var lt palette