Model                                     AIC       deltaAIC        AIC wgtModel Likelihood        no.Par.     -2*LogLike
psi(.),p(.)                             16.24           0.00         0.6445         1.0000              2          12.24
psi(gully),p(.)                         17.43           1.19         0.3555         0.5516              3          11.43
