Hello, I am trying to change the foreground and background colors of an owin mask object within SpatStat. Can anyone describe the syntax for specifting a list for par.binary? Thank You, Timothy Timothy S. Hare Grinnell College nahua at crosswinds.net ___________________________________ Build high quality traffic with the Web's Premier traffic building system. 2 to 1 ratio! http://www.itrafficstar.com/?ref=6