How to update Masetti model parameters ?

I’am try to validate a paper and I have a problem on what based equation that i can update the parameters of Masetti model parameters of mobility ?

The default material database already has the parameters for the Masetti model for Si. Please note that this particular model is only applicable to indirect bandgap materials (Si, Ge, etc.). The model is actually an empirical model and the parameters are found by fitting the equation to some experimentally measured data. If you are looking at some other material then you can look for published articles that have reported the fitting parameters. I did a quick google search for Ge and found a couple of articles that talk about fitting the Masetti model for Germanium. Unfortunately none of them reported the parameter values.

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