[R] Limiting number of tickmarks in lattice bwplot

[GL]

Have a simple bwplot with 24 ordered factors across the x axis. I would like
to only label every 4th tick mark so that the labels fit. I tried
scales=list(x=list(tick.number=6)), but I still seem to get 24 tickmarks and
24 labels. Full code is below:


bwplot(SumOfIn.Use ~ Hour | Period,
scales=list(x=list(tick.number=6)),horizontal=FALSE,las=2,main="Rooms
Running",sub="Timeframe: 8/09 - 12/09",xlab="Hour of Day",ylab="Rooms
Running",ex.main=0.7,cex.axis=0.5,data=dbs.weekday,as.table=TRUE,layout=c(2,1))

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