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But I can't figure out how to go from [itex]\frac{d\sigma}{d\phi}[/itex] to the total cross section. My guess was that you did the integral from [itex]\phi=0[/itex] to [itex]\phi=2\pi[/itex], but that's not helping since I can't tell either how they got the absolute value squared inside the sum..

Thanks for anyone who listens :)