Bad baseline when using CS_VE=y

[Yizhi Sun]

Hi,

I'm trying to process a 3D 15N noesy-trosy with qMDD. I got nice spectrum using CS/IRLS. But once I switch CS_VE on, I got bad baseline like this:

Thanks for any comments.

Best!

Yizhi

[Krzysztof Kazimierczuk]

Hi Yizhi,

You have to set phase parameter to phases you have in fidSP.com. For example, if phases are -yP0 36 -zP0 73. Then:

setenv phase '36 73'

For half-dwell time, i.e. P0 -90 P1 180 and f180 y, you keep phase of 0.

You can also share scripts with us, if you need more help.
Depending on the version of the program, you may have to change the sign of phase comparing to fidSP.com (there was such a bug some time ago).

Krzysztof

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Pozdrawiam,
Krzysztof Kazimierczuk<br />


Krzysztof Kazimierczuk, PhD
Laboratory of Intermolecular Interactions
University of Warsaw
Zwirki i Wigury 101, 02-089 Warsaw
tel. +48 22 8220211 ext. 421

[Yizhi Sun]

It worked! Thanks a lot. 

A related question, how different would it be if you use IRLS or IST to process your data?

Yizhi

[Krzysztof Kazimierczuk]

Hi,

IRLS can give better result than IST for demanding cases: high dynamic range of peak intensities and/or low sampling level. On the other hand IST is faster and less memory consuming. Use 200-500 iterations for IST (500 for NOESY and other difficult cases).

Regards,

Krzysztof

[Yizhi Sun]

Got it. Thanks a lot!

Yizhi