Hi all, If I select multiple models of a protein-DNA complex select #0:1-40.B #1:1-40.B #2:1-40.B #3:1-40.B #4:1-40.B #5:1-40.B #6:1-40.B #7:1-40.B where B is the DNA and then match match #0 #1 #2 #3 #4 #5 #6 #7 I obtain a message about the RMSD so it is working, but no superposition on the monitor... Also, selection of part of the models select #5:1-40.B #6:1-40.B #7:1-40.B followed by match #5 #6 #7 Report an error like "an even number of space-separated atom specs are required" Why? All atoms were selected. And in the previous case, where 8 models were selected using the same procedure, this message does not appear. In both cases selection is done properly (as judged from the monitor) but the match command gives a not clear response. All DNA models have the same sequence. I miss something... I'm using version 1.11 of Chimera on Linux Ubuntu. Thanks for your help, Marco