Gallery of Gnuplot examples
This is a place for examples of the gnuplot files I have used, other people have already provided many simple examples, I will just put gnuplot script here in case you can learn from them by example, usually I get the job done by the process of iterative hacking of my scripts.
FTO example
Plots a png and a postscript file using data output from another program, postscript can make use of more formating options for text.
source files:plot_T_FT0.gnu.txt, data1.txt, data2.txt. (You will have to download and run with gnuplot to see the postscript file).