Turning an "Expression Float" into a Float?

"Alasdair McAndrew" <[email protected]>
Newsgroups gmane.comp.mathematics.axiom.user
Message-ID <[email protected]> 
The command

integrate(exp(-x^2),x=0..1)

produces an expression involving the error function.  But how do I turn this
into a single Float?

Thanks,
Alasdair

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