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On Ethan Siegel's 'Starts With a Bang' blog...

http://scienceblogs.com/startswithabang/2010/06/28/how-do-we-use-the-cmb-to-learn/

...he points out that the FIRAS CMB data has 400 sigma error bars.

Since I've read that a 5 sigma value corresponds to a p-value of 3 x 10

^{-7}(approx. 1 in 3.5 million) I was wondering what p-value 400 sigma corresponds to?

Thanks,

Cerenkov.