Hi Evan, Probably you are looking at documentation that is newer than your version of Chimera. The Pipes & Planks arrowheads are in Chimera 1.7 daily builds, not the 1.6 production release. Pipes & Planks has been improved significantly since the 1.6 release. However, this feature is not available as a command, sorry. If you use the documentation in the Help menu (or from clicking the Help button on a dialog) it should be fairly well synchronized with whatever version you have downloaded. daily build download: <http://preview.rbvi.ucsf.edu/chimera/download.html#daily> "what's new in daily builds" (vs. current production release): <http://preview.rbvi.ucsf.edu/chimera/docs/relnotes/snapshot.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 20, 2012, at 1:18 PM, Evan Kantrowitz wrote:

Hi, Probably a dumb question, but I cannot figure out how to show arrow heads on pipes and planks. I found this info

Show arrow on helix and Show arrow on strand (both default true) place arrowheads on the C-terminal ends of secondary structure elements to indicate N→C directionality.

These are not on the pipes and planks tool. What is the format on the command line to use this commands

I tried Show arrow on helix Show arrow on helix true

Thanks Evan