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...equation and preferably with a prediction interval around the line? I have tried the lines() and predict() commands, using the linear model to plot, but get very whacky results. abline works great but does not include the quadratic term. Any help you could provide would be much appreciated, Ryan Harigan -- Ryan Harrigan, Ph.D. Center for Tropical Research Institute of the Environment La Kretz Hall, Suite 300 Box 951496 Los Angeles, CA 90095-1496 203-804-9505 iluvsa at ucla.edu