## 1.52.18 contours

    set contours [ ( <number> |
                   "(" { <value> } ")" ) ]
                 [ (label | nolabel) ]

The setting `contours` is used to define the set of ordinate values for which contours are drawn when using the `contourmap` plot style. If `<number>` is specified, the contours are evenly spaced – either linearly or logarithmically, depending upon the state of the `logscale c1` setting – between the values specified in the `c1range` setting. Otherwise, the list of ordinate values may be specified as a ()-bracketed comma-separated list.

If the option `label` is specified, then each contour is labelled with the ordinate value that it follows. If the option `nolabel` is specified, then the contours are not labelled.