A guy over at Dragonmount put this together.
Pretty cool to see the overall pattern.
Uhhh---
Yeah. I totally get it.
*nod?
*nods.
The picture is a link to the guy's explanation. But the width of each color refers to what percentage of the book is about a particular character or plot. So you can see Moiraine and Lans threads from New Spring onward, for example.