Question about setting different ylim for different panels

[sn248]

I am trying to set different ylim for the 2 panels in my xpose.VPC plot. Reading through the documentation of xyplot in lattice, I was thinking something like

scales = list(y = list(relation = "free")),
ylim = list(c(0,600),c(0,300)),

should work, but the limits for both the panels are set to (0,600). I also get the following warning

Warning messages:
1: In limitlist[id] <- lim :
  number of items to replace is not a multiple of replacement length
2: In limitlist[id] <- lim :
  number of items to replace is not a multiple of replacement length

Any help in how to set different ylim for different panels would be very much appreciated!

A similar setting in xyplot from lattice seems to be working and gives me different y-limits, e.g., the following works

library(lattice)
temp.cut <- equal.count(environmental$temperature, 2)
xyplot(ozone ~ radiation | temp.cut, data = environmental,
       scales = list(y = list(relation = "free",
                              limits = list(c(0,150),c(0,100)))))

Thank you!
SN