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Thomas/kajiura filter nofft#12

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Thomas-Ulrich wants to merge 11 commits intomasterfrom
thomas/kajiura_filter_nofft
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Thomas/kajiura filter nofft#12
Thomas-Ulrich wants to merge 11 commits intomasterfrom
thomas/kajiura_filter_nofft

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@Thomas-Ulrich
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I think I fixed errors in the Kajiura filter FFT implementation (in particular the fixed depth has to be given as a parameter and sigma must be computed with this depth, not with h_max).
I've also added an implementation without FFT allowing variable depths, which is actually not that slow.

The figure shows eta_diff at 16s with:
FFT (depth=1000m), FFT (depth 100m), non fft:
image

See the thesis of Max for reference.

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