Radius of circles matching the z-position value of points

Hi guys,

I am pretty new to the amazing grasshopper and trying to learn by reading the discussions here and trying out gh definitions.

I bumped over a definition: "Audio Frequencies in Rhino" created by Carlo Sammarco.

What I am trying to achieve is to project the generated points onto a flat surface and create circles around them. so far so good (I marked that area/group red in the attached definition) . I would now like to set the radius of each circle so it matches or corresponds to the z-position value of the points above. so the higher the point above each circle is, the bigger the radius of the circle. I tried several connections but it did not work .

Do you have any tipps or suggestions? I would help me a lot !

Thank you in advance and cheers form Hamburg