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The opacity is uniform, but you have multiple dots with duplicate values overlaying each other.

Thank you so much @Fil. I finally made some progress here: https://observablehq.com/d/cbf6047da8d9fe17. Have a good weekend!

I think you meant @Fabian Iwand 🙂

Ah that’s embarrassing 😂 . Thank y’all!!!!!!

No worries, Fil doesn't receive nearly enough praise for all he does. 😉