This is my GNU Plot help page. Which mostly includes examples of my own making.
The script below was used to generate graphics in the ACMTODS paper. The script is 
in the location indicated by the "cd" command.

{{{
cd 'h:\unl\research\DynamicMaxCount'
set terminal postscript eps monochrome blacktext
set grid lt -1
unset key
unset label 10
unset label 11
unset label 12
unset label 13

set xlabel "X" 0,-2
set ylabel "Y" -2,0
set xtics axis 0,1,10
set ytics axis 0,1,10
set size .7,.91
set xrange [0:10]
set yrange [0:10]

set output "pointssplit3.eps"
plot 'example1_data.txt' with points 9
set output

set parametric
set label 10 "A" at 4.45,5.5
set label 11 "B" at 5.45,5.5
set label 12 "C" at 4.45,4.5
set label 13 "D" at 5.45,4.5

set trange [0:10]

set output "pointssplit_boxed.eps"
plot 'example1_data.txt' with points 9, 5,t lt -1 lw 2, t,5 lt -1 lw 2
set output
}}}