[R] add my own calculated conficence interval to a plot

From: Simone Santoro <miseno77_at_hotmail.com>
Date: Mon, 28 Mar 2011 21:25:57 +0200

Hi,

I have a data frame like this:

var1=years
var2=Sex ratio (0<value<1)
var3=lower 95% confidence interval
var4=upper 95% confidence interval

Is there a way to add these confidence intervals to a plot like this? plot(years,Sex ratio,type="b")

Thanks in advance for any response                                                

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