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Pie sectors default to a thin black line as the sector edge. You can use this property to remove the edges completely, or set a differently coloured (maybe thicker) line as required:
ch.Set 'edge' 'white,solid,2'
This works well with inside value labels as shown in the example. Only solid edges are supported at present, although other edge-styles are accepted here. To remove the edges completely, use
ch.Set 'edge' 'none'
This sets the line-weight to 0, so no edge is drawn.