for the record, this issue is being addressed in PR: 
https://github.com/dealii/dealii/pull/2603

On Friday, March 27, 2015 at 2:01:37 PM UTC+1, Denis Davydov wrote:
>
> Dear all, 
>
> I might be wrong, but I think the Fourier vectors should be multiple of "2 
> \pi" in Step-27 as
> the integration is done on [0,1]^d (unit cell in deal.II, AFAIK), as 
> opposed to [-1,1]^d. 
>
> p.s. e^{ikx) and e^{-ikx} are orthogonal on [0,2\pi], for integer "k".
>
> Regards,
> Denis.
>

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