Contour labels

By default, contours are labeled with the actual contour level, using three significant digits. See the discussion on the `\LEGEND` qualifier for an alternate contour labeling facility.

Contour label size

The size of the contour labels is `CONTOURLABELHEIGHT`. If labels are not desired on the contours, set the `CONTOURLABELHEIGHT` characteristic to `0` to set the label height to zero before entering the `CONTOUR` command. The default is `%CONTOURLABELHEIGHT = 2`.

Contour label separation

The separation between contour labels is controlled with `CONTOURLABELSEPARATION`. The default is `CONTOURLABELSEPARATION = 10`.

Colours
Saving contour levels and coordinates