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Level Curve in a 3D Graph

Hi everyone!

I have a doubt about how to make a curve from a 3D Graph in Plotly. So it would be a level curve.

So I want to know how to graph only the level curve for z=0.05 (“valores_planos”=0.05)

To clarify, I put some graphs, where the script is included.

I thought on making something like " z = valores_planos = 0.05" but it doesn’t work. Some other idea?

Thank you very much !!