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set contour
set title "Demo of specifying discrete contour levels - default contours"
splot x*y
pause -1 "Hit return to continue"
#set discrete levels
set cntrparam levels discrete 0, 15, 75
set title "3 discrete contours at 0 15 & 75"
replot
pause -1 "Hit return to continue"
#set incremental levels
set cntrp level incr -20, 5, 9
set title "incremental contours starting at -20, stepping by 5"
replot
pause -1 "Hit return to continue"
#restore defaults
set title ""
unset contour
set cntrparam levels auto 5
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