I have a question about the map again.

The question relates to fatness. Specifically, how is fatness defined?

I can imagine two sets of fatness guides:
1) if a signal is abnormally strong it might grow fat in a single spot or;
2) if a path is open for a long time it may grow fat over time.

or

Perhaps a third which combines both sets of "fatness".

My sense is that it grows fat over time reflecting a paths "persistence" rather than a one off hot spot.

But I do not know so I am asking.

Thanks and best, Chas W7MAP/5