@User @User: "nrd" and "nrs" are the number of squares of drain and source, respectively, for purposes of calculating resistance, so it should be able to be estimated with

nrd='0.29 / W'

and

nrs='0.29 / W'

. Although I am not sure if that should be measured not to the edge of diffusion, but maybe to the contact center instead? Or the front edge of the contact?