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An gaussian-weighted smooth is drawn through the data.
ch.Set 'style' 'trend'
The degree of smoothing may be adjusted with the Flexibility setting.
Trend surface with 3D data
You can use the same fitting process with 3D data to put a trend surface through a set of spot-height values.
This can be a useful way to visualise a landscape given a series of discrete altitude values. Contours are drawn at the Z-tickmarks if style contour is set, and if style riser is selected, the risers are drawn from the surface rather than from the XY-plane.