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Hi, there is an old message on the mailing list, describing how the errors are calculated in Analysis. https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0905&L=CCPNMR&P=R3497&1=CCPNMR&9=A&J=on&d=No+Match%3BMatch%3BMatches&z=4 <https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0905&L=CCPNMR&P=R3497&1=CCPNMR&9=A&J=on&d=No+Match%3BMatch%3BMatches&z=4> As it is based on the noise levels bad quality (does this mean low signal to noise ratio?) should yield in big errors. Cheers, Melanie On 04/16/2012 05:22 PM, Martin Ballaschk wrote: > Dear all, > > most likely my problems with the small error values are coming from the bad quality of the spectrum. > > But anyway, if anyone knows how CCPN calculates the HetNOE errors, I'd appreciate if she could share the knowledge. I tried to dig through the CCPN documentation but couldn't find any information about this. > > Cheers > Martin > > -- Dr. Melanie Schwarten Institut de Biologie Structurale J.P. Ebel Laboratoire de Résonance Magnétique Nucléaire (LRMN) 41, rue Jules Horowitz F-38027 GRENOBLE Cedex 1