How can we write a legend that overlay several frames?

Using the `xpd`

parameter, the legend can exit its frame but still cannot enter the next frame.

```
par(mfrow=c(1,2))
plot(rnorm(120), rnorm(120))
legend(x = -0.1, y=0.1, legend = "Legend that covers both plots", text.col="red", cex=2, box.col="red", xpd=TRUE)
plot(rnorm(120), rnorm(120))
```

One dummy solution would be to add the same legend on each frame so that they perfectly complement each other. But that would be a real pain.

Answer:

Using mtext is not so good but maybe!

```
op=par( mfrow = c( 1, 2 ), oma = c( 1.3, 0, 0, 0 ) )
plot(rnorm(120), rnorm(120))
plot(rnorm(120), rnorm(120))
mtext("Legend that covers both plots", side=1, cex=1.5, col="red",outer = T,
xpd=TRUE)
mtext("Legend that covers both plots", line = -3,cex=1.5, col="red",outer = T)
par(op)
```

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