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Context I want to plot two ggplot2 on the same page with the same legend. http://code.google.com/p/gridextra/wiki/arrangeGrob discribes, how to do this. This already looks good. But... In my example I have two plots with the same x-axis and different y-axis. When the range of the the y-axis is at least 10 times higher than of the other plot (e.g. 10000 instead of 1000), ggplot2 (or grid?) does not align the plots correct (see Output below). Question How do I also align the left side of the plot, using two different y-axis? Example Code x = c(1, 2) y = c(10, 1000) data1 = data.frame(x,y) p1 <- ggplot(data1) + aes(x=x, y=y, colour=x) + geom_line() y = c(10, 10000) data2 = data.frame(x,y) p2 <- ggplot(data2) + aes(x=x, y=y, colour=x) + geom_line() # Source: http://code.google.com/p/gridextra/wiki/arrangeGrob leg <- ggplotGrob(p1 + opts(keep="legend_box")) legend=gTree(children=gList(leg), cl="legendGrob") widthDetails.legendGrob <- function(x) unit(3, "cm") grid.arrange( p1 + opts(legend.position="none"), p2 + opts(legend.position="none"), legend=legend, main ="", left = "") Output

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