[R] Vertical x axis labels with Trellis dot plots

[Steve Miller]

Using R 2.2.1 under Windows, I have developed a very busy Trellis dot plot
with 2 columns of 7 panels and dates on the x axes. Is there a way to print
the date labels vertically instead of horizontally so I can include more on
the graph? Also, can I take some control over which dates are printed (e.g.
1,4,7,10,13)? Nothing stood out to me on trellis.par.get().

Thanks for the help.

Steve Miller