Dear R-gurus,

I need to print several plots into a graphic device and I would like to print out a main title.
My code looks like 

x<-1:100
y<-x^2
z<-y/x
w<-exp(z)
par(mfrow=c(2,2))
plot(y~x)
plot(z~x)
plot(w~x)
plot(z~w)

Kind regards,

miltinho
Brazil

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