I have two xyplots that i want to superimpose (code below).  By default they
are displayed on slightly different y scales (one runs from 10 to 25, the
other from 10 to 30). I would like to force them both onto the same scale
(10 to 30) so the relation between the two is clear. Is there a way to do
this?
thanks much


pct_compl_chart <- xyplot(pct_compl ~ date,
col="red",
type="b",
pch=15,
scalse=list(tick.number=5),
ylab=list(label="Pct. Compl."),
layout=c(1,5),
xlab=list(label=""),
between = list(x = c(0, 0, 0), y = c(8,-10,-10,-10,-10))
)

time_pct_chart <- xyplot(time_pct ~ date,
col="blue",
type="b",
pch=15,
scales=list(tick.number=5),
ylab=list(label=""),
layout=c(1,5),
xlab=list(label=""),
between = list(x = c(0, 0, 0), y = c(8,-10,-10,-10,-10))
)

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