[R-sig-ME] how to extract the estimated scale in the results of lmer

[ts p]

Hello,

I got the estimated scale by lmer as follows:
Estimated scale (compare to  1 )  0.892683
My question is how to extract the value of the estimated scale from the 
results of lmer.
And I know in some software the scale is constrained to 1. how lmer can do 
it?

Thanks a lot!

Tian