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

[dadrivr]

David Winsemius wrote:
> What "mean summary line"? I count 8 lines and that matches the number  
> if id's with complete data.

Yea, I don't know why there is no mean summary line showing up.  I requested
it in the interaction.plot statement (fun = mean), and I don't get any
errors.  Any ideas?

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