|Calculate the radius per above and then if its less than 100 (or whatever you settle on ) set it to 100.
That's pretty much what I ended up with. I just defined a couple threshold values to set the minimum and maximum allowable radius.
Initially, I thought I would do something clever that scaled progressively according to the number of nodes. But this is much simpler, and looks good enough.
Thanks for your help. Have a great weekend.
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