[R] Accessing the fixed- and random-effects variance-covariance matrices of an nlme model

[Rob Forsyth]

I would appreciate confirmation that the function vcov(model.nlme)  
gives the var-cov matrix of the fixed effects in an nlme model.  
Presumably the random-effects var-cov matrix is given by cov(ranef 
(model.nlme)?

Rob Forsyth