On Jul 30, 2013, at 3:36 PM, Elaine Meng <meng@cgl.ucsf.edu> wrote:

One easy way is to do it with the mouse in the Chimera window.  Ctrl-click on the first atom and Select-Ctrl-click on the second atom.

I think the last part should be Shift-Ctrl-click.

--Eric

                        Eric Pettersen

                        UCSF Computer Graphics Lab

                        http://www.cgl.ucsf.edu