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Risers are drawn from the X-axis (or XY-plane in 3D charts) to each datapoint. If a baseline is defined, this is used as the target for the risers, rather than the axis.

ch.Set 'style' 'risers'

For polar charts the risers are drawn as radial lines from the centre.

Using risers to show residuals
When a modelfit or trend surface has been used in a Cloud chart (3D scatter) the risers are drawn from the surface to each datapoint, rather than from the XY-plane.

This provides a quick visual check of the residuals, and may help to locate the datapoints relative to the fitted surface in the projection of the 3D chart.

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