I'm doing a path plot with ggplot2, the result is looking very nice, but I want 
to give some indication of which direction the lines are going. I thought of 
using colour gradients, but it doesn't look right. What would be ideal is a 
line type that indicated direction, something like ">>>>>>>". Is there any way 
to achieve this? Or can anyone suggest another way of representing this 
information?

Malcolm
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