Jun,

The par() command is to give extra margin on right side to accomodate the y
axis label.
I recognize, like Rolf, that three y axis can be cumbersome, confuse. So, I
would adopt another approach using lattice::xyplot()

require(reshape)
x <- melt(x, id="Time")
str(x)

require(lattice)
xyplot(value~Time|variable, data=x, layout=c(3,1),
       type="l", scales=list(y=list(relation="free")))

Walmes.

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Walmes Marques Zeviani
LEG (Laboratório de Estatística e Geoinformação, 25.450418 S, 49.231759 W)
Departamento de Estatística - Universidade Federal do Paraná
fone: (+55) 41 3361 3573
VoIP: (3361 3600) 1053 1173
e-mail: walmes@ufpr.br
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