[R] Margin annotation

[David Arnold]

I have this code:

x=seq(80-3*15,80+3*15,length=200);
y=dnorm(x,80,15)
plot(x,y,type="l",lwd=2,col="red")
x=seq(80-3*15,70,length=100)
y=dnorm(x,80,15)
polygon(c(0,x,70),c(0,y,0),col="gray")
text(70,0.005,"70")

I'd like to draw the number "70" in red underneath a vertical arrow pointing
to the position of the number 70 on the horizontal axis.

Any ideas?

Thanks.

David.



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