Dear Michael, The SAS and SES values come from the MSMS package. I don't know what algorithm is used, but it may be described somewhere in the MSMS website or reference linked to that site: <http://mgltools.scripps.edu/packages/MSMS/> Best, 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 Feb 18, 2013, at 1:27 AM, Korbus, Michael wrote:

Dear Ladies and Gentlemen,

I have a question concerning calculation of areaSAS with chimera. Which algorithm is used? A Shrake-Rupley based algorithm?

Thank you for your help.

Sincerely,

Michael Korbus