Recent xschem sky130 symbols show the approximated capacitance as calculated from W, L, MF:
C=MF * (W * L * 2e-15 + ( W + L ) * 0.38e-15)
the two parameters are the area capacitance (camimc) and perimeter capacitance (2 * cpmimc) in the typical corner.
The shown values are of course only an approximated value.
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