midline of a surface

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Hamid
Hamid 2019-2-19
Hello,
I have a 3D surface with (x,y,z) coordinates on a number of nodes over the surface and a value (A) assigned to each node. I want to find the closest midline-node coordinates along the surface length and A at those nodes. The attached file contains all nodes. Any suggestion is appreciated.
x y z A
-5.878 2.593 -3.271 1.09E-13
-5.877 2.594 -3.273 1.51E-13
-5.880 2.593 -3.271 6.56E-14
-5.882 2.592 -3.269 0.00E+00

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