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In LateX if we want to insert a widehat over some word we just need to write: \widehat{ABCD}. In Mathematica, as far as I can see, we can only insert: `OverHat[ABCD]`, which does not puts really a widehat, but a small hat in the middle of the word.....
Hello. Thank you so much. I only needed to do a few changes and it worked. In order to help others that might have the same problem, what I have done was the following: FUB = ListPlot[{Transpose[{x[NN], CU}], Transpose[{x[NN], AQ}]}, Filling ->...