[Chimera-users] matching peptides with altenate locations

Hi, I would like to match two peptides; one with alternate conformations in residue 4 and 5. I have tried: match #0:1-9.c@ca #1:1-9.c@ca.a match #0:1-5.c@ca #1:1-3.c@ca | #1:4-5.c@ca.a but both don't work and give me the "unequal number of atom chosen" error message. I tried changing match to sel in the latter case and I can get 10 atoms; 5 from each model, which is what I intended. How should I deal with this? Thanks, Sumitro