Model                                     AIC       deltaAIC        AIC wgtModel Likelihood        no.Par.     -2*LogLike
psi(.),p(.)                             84.83           0.00         0.7211         1.0000              2          80.83
psi(gully),p(.)                         86.73           1.90         0.2789         0.3867              3          80.73
