Extracting data in 3d format

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So far, I have been extracting abs(emwHz) values for given parameter in a 2D cutplane in my loop antenna model. I would like to extract it in a 3D grid format.

However, most methods of trying a grid 3D dataset has resulted in errors, where Hz is an undefined variable, like as shown below.

"Undefined variable. - Variable: comp1.emw.Hz - Global scope Failed to evaluate expression. - Expression: comp1.emw.Hz"

Is there a way to overcome this error, or if not, to obtain Hz values in a 3d format?


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