Closing a polysurface face

Hi all
I have a open poly-surface as attached file. Can anyone help me to closed poly-surface?
Thank you
Best regards.
Model.3dm (35.6 KB)

Hello - this bit is messy -


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I modeled it by Grasshopper by loft 3 sections (picture).
so Do you know how to model it exactly?
Thank you.

Hello - that should work, I would think, but you need yo make sure the seam points on the sections line up to the same corners.