Model                                     AIC       deltaAIC        AIC wgtModel Likelihood        no.Par.     -2*LogLike
psi(.),p(.)                             80.52           0.00         0.6835         1.0000              2          76.52
psi(gully),p(.)                         82.06           1.54         0.3165         0.4630              3          76.06
