What do these nodes mean in the param viewer?

Some of them are filled in, and some are just small dots. Does this mean something? E.g. the second to outermost grey circle here as small dots instead of the filled in circles.
Also, do the colors mean anything? Why is the outermost branch a different color?

Hi @Raam,

I guess the dots in general describe the end points of individual tree branches. The green ones seem to stand for branch start points within the tree, and the orange ones for the dots that conclude the tree? Note how the last branch is also coloured red, instead of dark green like the preceding ones.
The small dots on the second to outermost circle probably show a branch that splits off, while continuing with a single branch (not multiple ones).

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The small dots on the second to outermost circle probably show a branch that splits off, while continuing with a single branch (not multiple ones).

Hmm, the trunk of the tree also does this but has a filled in dot…