Suggest:

Do a little RTFM here. Level 49 - go to your simulator manual and find out which model this is.  (For example BSIM3v2, or whatever it is) - Go find the web site for the model. (UC Berkley has all the BSIM's and there are web sites for pretty much all model developments, EKV, etc, etc.)

Then go read the model definition for the paramaters and how they are representated in the model. It's out there yiu just got to go digging for it.

Jerry