Good ! I'm glad you find it useful.

I need to add some error-checking at some point (For example to report any gaps in a numeric column, and forestall any division by zero).

May also add options for processing additional columns of figures (SPIE charts etc), and for choosing between evenly spaced generations and generational radii which grow with the square root of the generation number – to prevent the surface area from growing with the square of the generation.
(Avoiding the classic Florence Nightingale distortion, in other words :-)

(Below, for example, the radii are in the ratio of 1:Sqrt(2) so that the surface areas of sibling ranges sum to the surface area of their parent).

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