The easy solution to 1) is to create a DataView, with 1 of the columns 
being a calculated column that sums the areas you want combined.  See:  
http://jsfiddle.net/smjVd/4/

2) is the tricky part.  Are you wholly opposed to the idea of tooltips 
appearing on these points, or would they be ok as long as the interpolated 
data was left out?

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