Filling the mesh colors within the given closed polyline

I have generated the analysis grid and values and also transferred the values to mesh to display the results. I need the mesh colours to come strictly inside the closed polygon for better visualization. Thank you for the help in advance. File is attached for review and help.

Vijesh
Help.gh (39.3 KB)

Help.gh (42.9 KB)

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Another option could be to just add a Region Intersection, as shown below.

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@Erik_Beeren @Adam_M Thank you very much.