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Hello, I'm trying to assign the same atom to peaks in 2 different spectra (separate shift lists), but analysis allows me to do the assignment only in one of them. Once I have done that, the atom browser shows that the atom has not yet been assigned in the other spectrum/shift list (as expected), but it turns out to be impossible to do that. Actually, all atoms that are already assigned in shift list 1 seem to be blocked for assignemts in shift list 2 and the other way round. The shifts in the two experiments are very similar, and the experiments are linked to different shift lists anyway, so this is not a problem with the tolerances. I recently switched to a newer ccpnmr version, I haven't encountered this problem before. Any ideas? Cheers, Wolfgang