R help - Mar 2007 - Greenwood's Variance

I have specified error = "greenwood" in the survfit function:

summary(survfit(Surv(time, status) ~ 1,error = "greenwood", data=aml))

The output does not appear to give variance, but standard error.
Preferably I would like variance to be output, but is it okay to
convert std errror to variance, and how can I do this correctly?

Thanks
Murray

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