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  • $\begingroup$ First, thanks for make some kind of overview of my problem! I just have a few questions: 1. Did you use other constraints and/or starting values than mine? 2. I agree with the nice fit between the experimental data and the model and the resulting values, but where exactly do I have to implement the last code with "Block[..]" in my code? 3. Is it then possible to export the fitted values? $\endgroup$ Commented Mar 21, 2018 at 16:43
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    $\begingroup$ 0. don't mention it! 1. no, I just made ω explicitly dependent on f (and all associated symbols, too); similarly for Reff (dependent on f and α); I wanted to have expressions with explicit dependencies because that is easier to debug 2. you can evaluate it after FindFit evaluates; assuming all goes well it should produce a list of frequency-absorption pairs 3. Evaluate Export["fitted.txt",%,"Table"] after the Block. $\endgroup$ Commented Mar 21, 2018 at 16:56
  • $\begingroup$ Thanks again! But could it be that there is missing a bracket after "Block{..}"?-> Block[{...? and unfortunately there is the following error message: "With: With called with 1 argument; 2 or more arguments are expected". Is there missing something after "[..]Thread[f->x]}];" and the next "];" and a second message: "Transpose: The first two levels of {412,y} cannot be transposed" $\endgroup$ Commented Mar 21, 2018 at 17:48
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    $\begingroup$ please check the updated Block in the answer; I think it should do the trick, this time... (it was missing the left bracket in Block and the comma after the right curly brace in With; also, the last Transpose contained x which was out of scope (With)) $\endgroup$ Commented Mar 21, 2018 at 17:52
  • $\begingroup$ Great! Thats exactly the tool I need! Thank you very much for your effort! $\endgroup$ Commented Mar 22, 2018 at 10:59