To alter the radius of one or more pie segments:

chSet 'Radii' 90 90 100 50 20 100

The vector will be extended (with 100) to match the number of segments plotted. It gives the radius of each segment as a percentage of the normal pie radius. You may use numbers above 100 here, but the pie segments may collide with headings, legends and so on!

This property would normally be used with pies of equal segment angle (probably 8 or 16 segments) to make something called a ‘Rose diagram’. Consider the Polar chart as a better alternative here.

It may also be used to create a short pointer on a ‘Dial’ chart, for example to simulate two hands on a dial face.

See also ...
chDial – dial and gauge charts
chPolar – polar charts