[R] Change properties of line summary in interaction.plot

[dadrivr]

Is it possible to change the color/thickness of the summary line in an
interaction.plot without changing the other individual data lines?  I would
like to make the line from the summary function (mean) the color red and
thicker than the surrounding black lines.  How can I do that?

Here is a link to interaction.plot:
http://stat.ethz.ch/R-manual/R-patched/library/stats/html/interaction.plot.html

Thanks!

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