Hi, I have a project with multiple molecular systems which are nearly identical. When I try and assign a peak, the edit assignment dialogue gives possibilities from all molecular systems without indicating which molecular system each resonance belongs to. I therefore end up having to try each possibility to see if I get the warning "Molecular system MSI1 of assignment doesn't match previous assignments....." Is it possible to restrict the assignment possibilities to the molecular system associated with the appropriate experiment or to have some method for selecting a only specific molecular system? Cheers Andy -- Dr Andy Herbert Department of Chemistry University of Edinburgh West Mains Road Edinburgh UK EH9 3JJ Tel: +44 (0)131 650 4704 or 650 7372 Email: [log in to unmask]