I have produced a packed bubble chart for the sizes of planets. But the displayed size of the bubbles bears no obvious relation to the planet radius or squared radius or cubed or ...
e.g. Pluto with a size of 0.03 displ;ays as almost the same size as earth with a size of 0.79.and Mars with a size of 0.22.
It is not possible to show the size legend (the option is greyed out).
So I am very confused as to how the dimensions of the bubbles are used to represent size?
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