Gnuplot

Official gnuplot documentation

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GNUPLOT: not so Frequently Asked Questions

When plotting "points" data files from fupermod, you will need this: set datafile missing "."

Put in a multiplication symbol with {/Symbol \264} [1] and [2]

Error message "';' expected"

That syntax (linetype specification with just a number, but no keyword) has been deprecated for several years now. It had never been an officially documented feature anyway, and was removed ages ago. Have a look at "help plot style" to see how it's done. More

Deprecated:

plot with lines 1

Should be:

plot with lines ls 1