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...21 2007 2 31 2008 1 22 2009 1 23 I first use hist(age) to draw the histogram for age, then use lines(density(age)) to draw its kernel. But since I need to draw the four years kernel for age in one graph, I don't need the hist. I also tried the package lattice of kernelplot, But I still don't know how to draw the four years kernel in one graph. Also, I don't need the rug(age) in kernelplot, how can I delete it? Thanks. -- Yi Du [[alternative HTML version deleted]]