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Use a raised Hann window during resampling to limit Gibbs effect

Andre Offringa requested to merge limit-gibbs-effect into master

This limits the Gibbs artefacts a bit. A better approach would be to calculate the undersampled beam on a slightly padded grid and use an (unraised) Hann window, which goes to hard zeros at the edges and therefore eliminates the ringing altogether. That requires a bit of work.

Rectangular window: image

Raised Hann window: image

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