Dear Giacomo,
This is actually a feature - it is meant to do that. It can be a bit of a
surprose the first time you see it. The question is covered in at least
one thread on the discussion group. Go to
http://www.jiscmail.ac.uk/archives/ccpnmr.html, click on 'June 2007', and
select thread 45 ("spectrum doubles"). That has both questions, and fixes,
discussd in detail.
It is part of the way Analysis displays aliased spectra. Basically we
plot the same spectrum in all the aliased locations, so that you can see
the Methyl peaks in the methyl region, the Ca peaks in the Ca region, the
CO peaks in the CO region, etc. The peask markers are done with full lines
in the correct position, and with dotted lines in the aliased position.
The dotted box is the 'principal region' the one without aliasing.
Which regions are contoured for each spectrum is controlled by parameters
in the Spectrum Referencing popup (see the discussion thread for details).
Analysis will automatically reset the contoured regions so that all
regions with peaks in them are contoured. If you have aliased peaks in
your peak lists that will expand the regions. What often happens is that
people pick peaks manually while several spectra are displayed. That will
pick a peak i *all* the displayed spectra. So if you pick a CA peak and
a CO experiment is displayed you get a peak at 40ppm in the CO spectrum.
The recommended procedure is to 1) check your peak lists to see if there
are peaks where they should not be (try sorting by the position in peak
dimension you wnat to check), remove or realias the peaks that are out of
place, and then reset the widths in the Spectrum Reference display.
We od think that this kind of tiled display is actually correct and useful
when you have aliased peaks - once you get used to it.
Yours,
Rasmus
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Dr. Rasmus H. Fogh Email: [log in to unmask]
Dept. of Biochemistry, University of Cambridge,
80 Tennis Court Road, Cambridge CB2 1GA, UK. FAX (01223)766002
On Thu, 17 Apr 2008, Giacomo wrote:
> Hello,
>
> I have to open with CCPN some spectra both .ucsf and .nv.
> It's seems to be all right in opening in fact I create a new project, insert
> the molecular system and then open the spectra from "experiment > open
> spectra". The spectra is ok so I save it with "detailed save", then i quit
> the program.
> The problem appear when I open the project saved, it's quite difficult to
> explain so I attach some imagines of the spectra. You can notice that the
> real spectra is into the outlined zone, but now appear a "specular" spectra.
> Besides the visual problem the real problem is that sometimes selecting a
> peak of the "real" spectra the software assign the coordinates of specular peak.
>
> thanks for your attenction
>
> Giacomo
>
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