Cluster-robust standard deviation?

[Greg Petroski]

I have a very simple situation. I am estimating the mean of a reasonably normal variable, Rto, where each sampled unit unit contributes two measurements, one from each of two locations. The errors are cluster-robust.How can I get a robust standard deviation from the Robust SE? I want to pull the "meat" out of the sandwich. -

mean Rto, vce(cluster CaseNo)

Mean estimation Number of obs = 4,962

(Std. err. adjusted for 2,481 clusters in CaseNo)
--------------------------------------------------------------
| Robust
| Mean std. err. [95% conf. interval]
-------------+------------------------------------------------
Rto | 4.064 .0236 4.018 4.111
--------------------------------------------------------------

[George Ford]

it's stored in e(sd).

ereturn list

matrix list e(sd)

[Greg Petroski]

Thank you.