R help - Mar 2011 - pdf device - different page orientation and different plot sizes

Hello R,

I would like make single pdf file in which the the pages are are of mixed
format. 
Manual states this code (down). The problem is the second "{}"
overwrites
the first "{}", but I want to append them.

require(graphics)
require(stats)
HBA=read.table("file.txt",header =FALSE,sep = "", dec =
",",fileEncoding "", encoding = "unknown",
skip=19,nrows=400)
attach(HBA)

{
pdf(file ="file.pdf",width=3.2,height=2.5,paper="A4")
par(mfrow=c(4,2))
plot(V1,V2,type = "l")
lines(V29,V30)
plot(V3,V4,type = "l")
lines(V5,V6)   dev.off()
    dev.off()
}

{
pdf(file ="file.pdf",width=11,height=7,paper="A4r")
par(mfrow=c(1,1))
plot(V1,V2,type = "l")
lines(V29,V30)
plot(V3,V4,type = "l")
lines(V5,V6)   dev.off()
    dev.off()
}



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