Model                                     AIC       deltaAIC        AIC wgtModel Likelihood        no.Par.     -2*LogLike
psi(.),p(.)                             77.24           0.00         0.7301         1.0000              2          73.24
psi(gully),p(.)                         79.23           1.99         0.2699         0.3697              3          73.23
