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How to show the second abline ?

I have no idea where gap.plot() came from, so I can't reproduce this,
but you almost certainly need

y ~ x

in your formula.

abline(coef(lm(y ~ x)),col=1)

Sarah
On Fri, Nov 8, 2013 at 11:04 AM, Domokos P?ter <domszi at gmail.com> wrote: