Go to the "Evaluation/Auto fit" menu item to select the automatic method.
The program only requires a short time to determine the displacement factors.
The solution given in Langguth/Voigt is:
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T = 1.1 · 10-3 m²/s
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S = 2.4 · 10-4 m²/s.
The minor differences are due to the purely visual evaluation employed by Langguth/Voigt.
If you adopt the result text, it is entered into the "Result text" box in the form.