How to draw this equation?

Hi there!
I’m a total noob in Grasshopper… don’t understand yet all functions and I want to draw this surface to test the Paul Trap like this article: The Mechanical Analogue – A QuadruPaul Ion Trap (wordpress.com)

How can I get to draw the equation? It may be easy for someone with experience but I really don’t know how to start…

Thanks

saddle surface.gh (8.5 KB)

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Thank you very much Seghier :slight_smile: