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Mass flux rate parameters in the KF-scheme module in WRF

Dear WRF-experts,

I am looking for the following variables in the KF-scheme physics module in WRF:

Coefficient related to downdraft mass flux rate (Pd)
Coefficient related to entrainment mass flux rate (Pe)

Unfortunately, I can't find these variables Pd and Pe in the module (WRF/module_cu_kf.F at master · wrf-model/WRF).
Is there any master file that contains description of the parameters in the physics modules?
Or perhaps, anyone can point me to the right variables in the KF physics scheme?

I'll appreciate any help on this.