set cntrlabel {format "format"} {font "font"} set cntrlabel {start <int>} {interval <int>} set contrlabel onecolor
set cntrlabel controls the labeling of contours, either in the key (default)
or on the plot itself in the case of splot ... with labels. In the latter
case labels are placed along each contour line according to the pointinterval
or pointnumber property of the label descriptor. By default a label is
placed on the 5th line segment making up the contour line and repeated every
20th segment. These defaults are equivalent to
set cntrlabel start 5 interval 20
set contours; splot $FOO with labels point pointinterval -1
A contour label is placed in the plot key for each linetype used. By default each contour level is given its own linetype, so a separate label appears for each. The command set cntrlabel onecolor causes all contours to be drawn using the same linetype, so only one label appears in the plot key. This command replaces an older command unset clabel.