Hi Paul, If you used Axes/Planes/Centroids (or command "define"), you can write the info to a file using the Save button on the table of axes/planes/centroids objects. <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/structuremeas/structuremeas.html#objectlist> If you used the "measure inertia" command, it reports the values in the Reply Log (show with menu: Favorites... Reply Log). <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/measure.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 Apr 9, 2012, at 11:24 AM, Gwo-Yu Chuang wrote:

Dear all,

I am trying to figure of the principal inertia axis of a protein domain using Chimera. Is there any way to get the vector of the axis (the values), besides just showing it on the screen? Many thanks

Yours Sincerely, Paul