I want to draw an X-Y plot where each point has a kind of "third dimensional" value that I want to represent using different points "size" (points are circles with different diameters).

I already successfully used the TikZ plotting capabilities, and want to ask, can I achieve easily the effect previously described? What are the other libraries I can/should use for this purpose?

I am not looking for a detailed solution, but for the right direction to start with.

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