[R] cov.unscaled in gls object

[Sven Garbade]

Hi list,

can I extract the cov.unscaled ("the unscaled covariance matrix") from a
gls fit (package nlme), like with summary.lm? Background: In a fixed
effect meta analysis regression the standard errors of the coefficients
can be computed as sqrt(diag(cov.unscaled)) where cov.unscaled is
(X'WX). I try do do this with a gls-fit. 

Thanks, Sven