Model                                     AIC       deltaAIC        AIC wgtModel Likelihood        no.Par.     -2*LogLike
psi(.),p(.)                             47.23           0.00         0.5878         1.0000              2          43.23
psi(gully),p(.)                         47.94           0.71         0.4122         0.7012              3          41.94
