My guess, continuing from Rolf, is that you should be using conditioning bwplot(~ y | f2, df, layout=c(3,1))
> On Jan 16, 2022, at 22:22, Rolf Turner <r.tur...@auckland.ac.nz> wrote: > > xxx <- trellis.par.get("box.umbrella") > xxx$lty <- 1 > trellis.par.set(box.umbrella=xxx) > junk <- rnorm(42) > bwplot(junk) ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.