What is the physical meaning and range of the Tmax, Tf and frequency in VF fit?

01 January 1970 0 4K Report

What is the physical meaning of the Tmax, Tf and frequency in VF fit? I am getting some numbers by fitting temperature data to VF , but I am not sure if these numbers should be within certain range, for example Ea=0.98mv and f=10^12, are these real?

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