Adding Direction Arrows to Plots

Questions
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1

I have a plot with multiple curves on it. I would like to add lines indicating a direction along those lines. For example, if I had a horizontal line on a plot, I would like to add arrows pointing to the right on the curve. Can arrows be added to plot lines?

Thanks,
Allen

2

This might help.

http://stackoverflow.com/questions/5074921/plotting-arrows-at-the-edges-of-a-curve