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...o white, the only group that is plotted is the last one, as panel.fill overwrites all the previous ones. Is there any way to set the panel background color for the first panel to a color and keep the rest transparent? My code looks like this: #first set defaults for getting more distinct symbols superp.symbol <- trellis.par.get("superpose.symbol") superp.symbol$pch = 15:21 superp.symbol$cex = 1.5 trellis.par.set("superpose.symbol", superp.symbol) #set the default for the colors in the symbols superp.lines <- trellis.par.get("superpose.line") superp.lines$lty &...