是否可以将面板标签放在格子的底部？

Question

是否可以在底部而不是顶部放置面板标签（即3gears，4gears ......）？

# Lattice Examples
library(lattice)
attach(mtcars)

# dotplot for each combination of two factors
dotplot(cyl.f~mpg|gear.f,
        main="Dotplot Plot by Number of Gears and Cylinders",
        xlab="Miles Per Gallon")

谢谢！