Just a minor error in the gnuplot help (inside gnuplot): while searching how to add discrete cntrparam levels to a "cntrparam levels incremental" statement, I've come across the 3rd example (searching in "cntrparam examples") in which it's said "9 incremental contours starting at -20, stepping by 5" while the statement "set cntrparam levels -20,5,9" does another thing, namely: contours starting from -20, stepping by 5, up to 9. In fact, there are only 6 contours since a 7th contour would go beyond 9.
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I can't find this text or example anywhere in the current documentation files. What version of gnuplot, or more specifically which version of the manual, did you find it in?
gnuplot 5.4 patchlevel 8
An Interactive Plotting Program
Thomas Williams & Colin Kelley
Version 5 organized by Ethan A Merritt and others
This manual was originally prepared by Dick Crawford