Dear all
I am trying to make a plot in xyplot lattice by groups. I would like to show 
"0" in y axis but I don't want to be aligned with the x axis. I want to be a 
little bit above.
I have tried many options but I don't get what I want. I also tried ylim=c(0, 
80) but both 0 and 80 are fully aligned with the x-axis and the upper boundary 
of the plot, respectively:
xyplot(upper.zn + Zn2 + lower.zn ~ sdate | Location, type="b", as.table=TRUE, 
data=dat, pch=c(22, 21, 22), lty=c(2, 1, 2), ylim=c(0, 80),
       index.cond=list(c(3, 1, 2)), ylab="Percent (%)", 
par.strip.text=list(col="white", font=2, lines=1.5),
       lattice.options = modifyList(lattice.options(), 
list(skip.boundary.labels = 0)), 
       par.settings=my.settings, col=c("red", "black", "red"), fill=c("red", 
"black", "red"), 
       key=dat_key, scales = list(x = list(at = sdate, labels = format(sdate, 
"%b-%y"))), xlab="Date",
       panel = function(x, y, ...) {
         panel.grid(h = -1, v = 0, lwd=1, lty=3, col="grey")               
         panel.abline(v=sdate, lwd=1, lty=3, col="grey")              
         panel.xyplot(x, y, ...)
         }
         )
when I use the following, 80 is a bit lower than the upper boundary of the 
plot, which is what I want, but 0 is not showing: 
xyplot(upper.zn + Zn2 + lower.zn ~ sdate | Location, type="b", as.table=TRUE, 
data=dat, pch=c(22, 21, 22), lty=c(2, 1, 2), 
       index.cond=list(c(3, 1, 2)), ylab="Percent (%)", 
par.strip.text=list(col="white", font=2, lines=1.5),
       lattice.options = modifyList(lattice.options(), 
list(skip.boundary.labels = 0)), 
       par.settings=my.settings, col=c("red", "black", "red"), fill=c("red", 
"black", "red"), 
       key=dat_key, scales = list(x = list(at = sdate, labels = format(sdate, 
"%b-%y")), y=list(at=c(0, 20, 40, 60, 80))), xlab="Date",
       panel = function(x, y, ...) {
         panel.grid(h = -1, v = 0, lwd=1, lty=3, col="grey")               
         panel.abline(v=sdate, lwd=1, lty=3, col="grey")              
         panel.xyplot(x, y, ...)
         }
         )I have also attached a reproducible example in case you want to see 
in more detail my data. 
I would very much appreciate any suggestions on this. 
Thank you in advance.
Kind regards,Maria
structure(list(Location = structure(c(3L, 2L, 1L, 3L, 2L, 1L, 
3L, 2L, 1L, 3L, 2L, 1L, 3L, 2L, 1L, 3L, 2L, 1L), .Label = c("downstream", 
"spill", "upstream"), class = "factor"), Date = structure(c(1L, 
1L, 1L, 2L, 2L, 2L, 3L, 3L, 3L, 4L, 4L, 4L, 5L, 5L, 5L, 6L, 6L, 
6L), .Label = c("2016-04-27", "2016-06-28", "2016-08-25", "2016-10-25", 
"2016-12-21", "2017-02-20"), class = "factor"), Zn2 = c(29.92476703, 
12.84040165, 22.496731, 23.98425342, 41.51335929, 15.51232289, 
21.73037433, 13.42082139, 10.99209223, 20.8246236, 14.01283297, 
15.677398, 28.1496556, 13.91586565, 13.02749294, 31.16736498, 
12.47368407, 17.65740863), upper.zn = c(55.59799624, 22.0700594, 
41.60901086, 45.60219163, 77.99892514, 26.94058693, 40.95851559, 
22.96901479, 20.17470754, 40.60564483, 25.07031719, 30.42278408, 
51.79389664, 23.94367855, 24.4693001, 55.5185782, 22.03829768, 
33.23577364), lower.zn = c(13.91220671, 6.964933684, 11.73910885, 
10.69063953, 20.14242582, 7.044781184, 10.35462038, 7.472893173, 
5.32431795, 9.602007459, 7.830503865, 6.971944054, 14.38413938, 
8.164688468, 5.826650446, 15.93821078, 6.725540245, 8.519928496
)), .Names = c("Location", "Date", "Zn2", "upper.zn", "lower.zn"
), class = "data.frame", row.names = c(NA, -18L))
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