[R-sig-Geo] grid.text with rasterVis::layerplot

[Tiffany Smith]

Below is a chunk of code that plots a rasterStack with 6 layers; I am trying to put labels a-f in the bottom right corner of each plot. The code below only shows the letter “a”, how do I get different letters to show in the bottom left corner of each of the 6 plots as I use levelplot?

levelplot(positive,par.settings=myTheme,names.attr=c("","","","","",""))+layer(sp.lines(conus))+layer(sp.lines(n.am))+layer(grid.text(c("a.","b.","c.","d.","e.","f."),.95,.1))

Thanks,
Tiffany
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