ChartGroup.SizeRepresents (PowerPoint)

Returns or sets what the bubble size represents on a bubble chart. Possible return values are xlSizeIsArea - The area of the bubble, xlSizeIsWidth - The width of the bubble.

This property can be either of the following XlSizeRepresents constants:

ActivePresentation.Slides(1).Shapes(1).Chart.ChartGroups(1).SizeRepresents = xlSizeIsArea