Hi, I was using Gviz package to create a boxplot. I understand that Gviz uses "panel.bwplot" to create the boxplot. Is there any way that I can remove the dashed line surrounding each pair of boxplots? Here is some sample code: ############# library(Gviz) thisdata <- matrix(sample(1:100,60),nrow= 10,ncol=6) positions <- sample(1:100,6) limit1 <- min(positions)-1 limit2 <- max(positions)+1 colnames(thisdata) <- positions dgroups <- c(rep('sample1',6),rep('sample2',4)) chr <- "chr1" d4x <- DataTrack(start=positions, width=2,         data=thisdata,chromosome=chr,         name="test",groups = dgroups,type = "boxplot",         box.ratio=0.6,         box.width=1.5 )  #"box and whisker plot" plotTracks(d4x,from=limit1,to=limit2) ############################### many thanks! [[alternative HTML version deleted]]