[R] lattice panel.abline use

[jjap]

Dear R-users,

I am unsuccessful in trying to add an horizontal line to all graphs in the
example below:

library(lattice)
val<-runif(15)
x<-rep(seq(1:5),3)
type<-c(rep("a",5), rep("b",5), rep("c",5))

xyplot(val ~ x | type, panel.abline(h=.6))

Any hints are appreciated.
Best regards,

---Jean



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