How to add a title to the legend scale using levelplot in R?

Question

I would like to add a title to my legend for this plot:

library(lattice) x = 1:10 y = rep(x,rep(10,10)) x = rep(x,rep(10)) z = x+y levelplot(z~x*y, colorkey = list(labels = list(cex=1,font=2,col="brown"), height=1, width=1.4), main = list('b',side=1,line=0.5)) 

What produces:

Answer 1

 library(lattice) library(grid) x = 1:10 y = rep(x,rep(10,10)) x = rep(x,rep(10)) z = x+y levelplot(z~x*y, colorkey=list(labels=list(cex=1,font=2,col="brown"),height=1,width=1.4),main=list('b',side=1,line=0.5)) trellis.focus("legend", side="right", clipp.off=TRUE, highlight=FALSE) grid.text(expression(m^3/m^3), 0.2, 0, hjust=0.5, vjust=1) trellis.unfocus()