I have fitted my EIS Nyquist plot using EC lab software. Now I need to calculate the double layer capacitance value. For the element Q (constant phase element), there are two parameters with the units as follows;

For instance,

Q1 = 4.1 e-3 F.s^(a-1)

a1 = 0.775

What is the capacitance value for this fitted data? And how to derive it?

Kindly awaiting for the valuable answers

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