common title for graphs in a (1x2) layout

Dear all,

Many thanks for the help suggesting the use of "layout" cmd.

How to insert a title in a 1x2 layout? The title is related to both graphs.
I looked for it in help, unsuccessfully.

Thanks in advance,
Rodrigo.

my reproductible code:
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def.par <- par(no.readonly = TRUE)

nf <- layout(matrix(c(1,2), 1,2,byrow=T), c(1,1), c(1,1), T)

layout.show(nf)



plot(rnorm(10,0,1))

plot(rnorm(10,0,0.1))

par(def.par)

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