Hi George, You can define centroids for the rings and then measure the distance between those centroid objects. See "Axes/Planes/Centroids" (under Tools... Structure Analysis) and/or command "define": <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/structuremeas/structuremeas.html#axes> <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/define.html> The objects you have defined will be listed in a dialog, and you can measure distance simply by choosing two objects (rows) in the dialog, or by using the "distance" command. <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/structuremeas/structuremeas.html#objectlist> <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/distance.html> I hope this helps, Elaine ---------- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Sep 6, 2012, at 2:26 AM, George Tzotzos wrote:

Hi everybody,

I'm trying to work out stacking interactions between two benzene rings. Is there a way to measure the distance from the center of the benzene rings of a Tyr to the center of the benzene ring of a Phe residue?

Your help suggestions / help much appreciated as always

Regards

George

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