Hi there, in different CC-spectra containing 300 and more peaks, I aim to put a single frequency for an atom of a residue, which is assigned to other atoms of its own or other atoms close by. If I pick this peaks in the spectrum, this atom frequency varies a little from peak to peak due to quality of the spectrum or overlap, but can be very clearly located in others. At the moment I solve this, i.e. put the shifts on the same frequency, by going through every peak in Peak : Peaklist, but this is very time-consuming. Is there another way to set the frequency ? Thank you as always very much! Carolin ------------------------------------------------------------ Carolin Seuring ETH | Zurich | www.bionmr.ethz.ch Phone: +41 44 6337646 E-mail: [log in to unmask]