Here is an intro about matrix https://optics.ansys.com/hc/en-us/articles/360034929613-matrix-Script-command
Since this is a 2D matrix, you can access it as
where n is the index for fill factor., eg, n=1
you have the first value of the fill factor M(1,1); and neffTM and neffTE are the correspodent neff for this fill factor.
Please try and compare your original data.
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