Greetings The 'trace' function in heatmap.2 says the distance of the line from the center is proportional to the size of the measurement. What is the measurement? Thanks for the help. Mike Michael Muratet, Ph.D. Senior Scientist HudsonAlpha Institute for Biotechnology mmuratet at hudsonalpha.org (256) 327-0473 (p) (256) 327-0966 (f) Room 4005 601 Genome Way Huntsville, Alabama 35806