# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'pointsize.1.png'
unset border
unset key
set style data lines
unset xtics
unset ytics
unset ztics
set title "plot with variable size points" 
set xrange [ * : * ] noreverse writeback
set x2range [ * : * ] noreverse writeback
set yrange [ * : * ] noreverse writeback
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
NO_ANIMATION = 1
## Last datafile plotted: "world.cor"
plot 'world.dat' with lines lt 3,      'world.cor' using 1:2:(5.*rand(0)) with points lt 1 pt 6 ps variable