[Ifeffit] Filter window shape for FT?

Scott Calvin SCalvin at slc.edu
Thu Sep 28 11:48:00 CDT 2006

Just to clarify...do you mean you're doing the fits in q-space (i.e. 
the back transform)? Or do you actually mean that the window used in 
k-space to get to R-space shouldn't have sharp corners? After all, if 
you're fitting in R-space, Artemis doesn't use an R-space window per 
se, just a fitting range.

--Scott Calvin
Sarah Lawrence College

At 12:36 PM 9/28/2006, you wrote:
>I've always been told that when doing Fourier filtering, the R-space 
>window shouldn't have sharp corners.  Artemis, for instance, allows you
>to vary this, and by default puts shoulders on the window.  I 
>have  a user who now wants the sharp corners, claiming that it 
>provides the best
>filtering.  He describes this as "doing the FT in a region of 
>R-space".  What does the Assembled Multitude think of the risk of termination
>effects with a rectangular window?
>    mam

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