Hi, The bound resonances check-box in the assignment popup isn't quite behaving as I would expect e.g. for a 13C 3D HSQC NOESY with the experiment prototype full name set to H[C]_H.NOESY, and F1=is indeed bound 1H, F2 = 13C, F3 = unbound 1H, when I check the "Bound resonances" box then the F3 dimension is restricted in cases where there are resonance possibilities that are (potentially) bonded to the same 13C atom as possibilities in the F1 dimension (whether there's a connecting 13C assignable to that peak or not). I would expect that the F3 dimension in this case would always be unaffected by the Bound resonances check box, but that the combination of Bound resonances and Restrict to repeated spin systems, might produce the behaviour I observe. Brian PS - could someone enlighten me on this question about experiment prototypes? It seems that experiment prototypes are ascribed that the level of experiments, but that there is no way of remapping the order of dimensions in individual instances of spectra. Is that right? Although for use with analysis, this should not be a problem (since you can always adjust how you see the spectra), there may be processing reasons, and certainly were good reasons in other software, as to why you might choose to reorder dimensions. If my interpretation of the model/software is right then you wouldn't be able to store differently ordered versions of the same experiment together, or if you did the prototype would be wrong for some. Appologies if I'm just being dumb. -- Dr. Brian O. Smith ---------------------- B Smith at bio gla ac uk Division of Biochemistry & Molecular Biology, Institute Biomedical & Life Sciences, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK. Tel: 0141 330 5167/6459/3089 Fax: 0141 330 8640