UMAP contours get cut off

[allenyen]

Hi, Thanks for developing this great visualization tool. When plotting the circlize plot, I am noticing that the UMAP contours are getting cut off in a square shape within the circle. Here are some examples from my plot.

I have tried adjusting the scale value in prepare_circlize_data to make it smaller, but the clipped areas remain. I have also noticed that your example on the front page also has the clipped edges. Any suggestions on how to fix this?

Thanks!