This contouring by block is still in there. Another thing on the TBD
list!
Wayne
On Thu, 25 Oct 2007, Brian Smith wrote:
> On Thu, 25 Oct 2007, Mark Pfuhl wrote:
>
> > Something completely unrelated:
> > I occasionally notice that aliased peaks appear out of nowhere (example
> > attached). For my example (simple 15N hsqc, no truly aliased peaks) the edge
> > of the spectrum is set to 137.037 ppm (coming straight from Topspin) and yet
> > I get a peak clearly on the outside, just beyond 138ppm. When I change the
> > boundary manually to 137.0 ppm the peak disappears.
> > Do others see this one as well?
>
> Often. I guess Wayne can give chapter & verse, but as I understand it
> it's a precision/rounding problem. I guess the 137.037 puts you right on
> the edge of the spectrum and might be interpreted as just inside or just
> outside the spectrum boundary depending on how the two numbers are
> represented. Since the region that analysis contours is blocky, you'll
> therefore get the next block's worth of contours beyond the edge of the
> data file. There was discussion of making it possible to turn the contour
> tiling off for people who really hate it, but I can't remember if it ever
> happened.
>
> Brian
>
> --
> Dr. Brian O. Smith ---------------------- B Smith at bio gla ac uk
> Division of Biochemistry & Molecular Biology,
> Institute Biomedical & Life Sciences,
> Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK.
> Tel: 0141 330 5167/6459/3089 Fax: 0141 330 8640
>
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