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 ------------------------------------------------------------------- Evan R. Kantrowitz, Ph.D evan.kantrowitz@bc.edu<mailto:evan.kantrowitz@bc.edu> Boston College Tel. 617-552-4558 Department of Chemistry FAX 617-552-2705 Merkert Chemistry Center, Rm 239 www2.bc.edu/~kantrow<http://www2.bc.edu/~kantrow> Chestnut Hill, MA 02467 -------------------------------------------------------------------