[R] Adding text to a multiplot (via mfrow)

[smj_115]

Hi

I have created a set of 4 barplots using mfrow=c(2,2) and need to
add a heading that spans the margin of the bottom 2 graphs. 

I have used locator(1) to find the coordinates but I dont seem to be able to
add text anywhere on this multiplot.

I would be really grateful if anyone could tell me if there is a simple
method of achieving this.

Many thanks

Sam Jones
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