If this is not already implemented in Coot, it would be an excellent addition to the "future features" list. O has this capability, and it is often useful to track the distance between two atoms while manipulating chi angles, etc. Cheers, ___________________________________________ Roger S. Rowlett Professor Department of Chemistry Colgate University 13 Oak Drive Hamilton, NY 13346 tel: (315)-228-7245 ofc: (315)-228-7395 fax: (315)-228-7935 email: [log in to unmask] -----Original Message----- From: Mailing list for users of COOT Crystallographic Software [mailto:[log in to unmask]] On Behalf Of Ye Sent: Monday, June 25, 2007 11:51 AM To: [log in to unmask] Subject: [COOT] Tracking a distance Dear all, How can I keep tracking a distance between two atoms in coot? I mean if I move one CA atom, is it possible to get the living distance info between this CA atom and another CA atom? Thanks. Ye