Lattice: don't draw unlabled tick marks

If I only want axis labels on the left and bottom I can set
alternating=F like in the following example:

 Depth <- equal.count(quakes$depth, number=8, overlap=.1)
 xyplot(lat ~ long | Depth, data = quakes, scales=list(alternating=F)

I also would like to get rid of the unlabeled tick marks (top and
right). How can I do that?

cu
	Philipp

Dr. Philipp Pagel
Lehrstuhl f?r Genomorientierte Bioinformatik
Technische Universit?t M?nchen
Wissenschaftszentrum Weihenstephan
85350 Freising, Germany
http://mips.gsf.de/staff/pagel