Draws contour lines at each major tickmark on the Z-axis.

chSet 'style' 'contours'

Works with the modelfit and trend styles on the Cloud charts, and on any Response surface with ‘lines’ drawn. The contour lines will appear smoother if a higher mesh density is used (the default is to compute the fitted surface at each X and Y major tickmark for Cloud charts).

You may also use this style with 2-dimensional scatterplots, as long as you provide the Z-values as numeric value-tags.

See also ...
Density – of fitted mesh surface