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Problem with fitting the Prony series into the experimental Data

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I have the following experimental data from the DMA measurment of temperature sweap.In the MCalibration software, I tried to fit the ABAQUS LE-PRONY01-WLF model to this data.

But I can't adjust anything except a horizontal line. I tried to keep the first part of the data from 20°C to 50°C to see if the software could adapt something to it, but the adapted data was a horizontal line!

I would be appreciated if you have some ideas about this problem.

Many thanks in advance