Model                                     AIC       deltaAIC        AIC wgtModel Likelihood        no.Par.     -2*LogLike
psi(.),p(.)                             34.10           0.00         0.6142         1.0000              2          30.10
psi(gully),p(.)                         35.03           0.93         0.3858         0.6281              3          29.03
