Dear friends - below is a small example showing a problem I have understanding doubleYScale from latticeExtra - R version 3.0.2 (2013-09-25) -- "Frisbee Sailing" Copyright (C) 2013 The R Foundation for Statistical Computing Platform: x86_64-w64-mingw32/x64 (64-bit) Both obj1 and obj2 are formatted as I wanted - but when combined the formatting is lost. How comes? Best wishes Troels Ring Aalborg, Denmark library(latticeExtra) T <- seq(1,200,length=100) Y1 <- 10+2*T+0.05*T^2 + rnorm(100,0,40) Y2 <- 0.1 + sqrt(T)+rnorm(100,1,1) tesobj <- data.frame(T=T,Y1=Y1,Y2=Y2) obj1 <- xyplot(Y1~T,tesobj,xlab=list(label="Time",cex=1.5),ylab=list(label="Y1", cex=1.5),scales=list(y=list(cex=1.2),x=list(cex=1.2)), panel = function(x,y,...){ panel.xyplot(x,y,...,pch=19) panel.loess(x,y,...,lwd=3) }) obj1 obj2 <- xyplot(Y2~T,tesobj,xlab=list(label="Time",cex=1.5),ylab=list(label="Y2", cex=1.5),scales=list(y=list(cex=1.2),x=list(cex=1.2)), panel = function(x,y,...){ panel.xyplot(x,y,...,pch=20) panel.loess(x,y,...,lwd=3)}) obj2 (sd <- doubleYScale(obj1,obj2,add.ylab2=TRUE))