Hi, I forgot to mention to both of you that there is also a Chimera tutorial that is all about attributes: <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/tutorials/attributes.html> and another that explains how to make a figure showing attribute (B-factor) values with color: <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/tutorials/bfactor.html> Besides the "Render by Attribute" tool with graphical interface, you can also use the "rangecolor" command to show attribute values with color: <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/rangecolor.html> 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