[R] extracting variance co variance matrix from system package

[Dereje Bacha]

I run system of equations. The system package gives variance
covariance matrix for each equation. I want to extract the variance covariance 
matrix
(of the coefficients) for each equation. How do we extract it?. 
Y1~X1+X2
Y2~X1+X2
fit.ols<-system (system, ols,
data)……. To extract it I wrote as follows:
fit.ols$coefCov [[eq1]].
 it did not work. 

I
want it to apply to delta method. I need help please.  Thank you!. . 
Dereje
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