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Add hover states to the lines on the charts so that it's easy to tell which variation is which by hovering on a line. Something like this: http://projects.flowingdata.com/life-expectancy/
Hovering over a variation in the table should probably also activate a hover state in the chart for the corresponding line.
Not necessary for initial launch.
A bit more detail about how this should work:
Closing this, and spinning the last bullet point to a separate issue (#49)
@matthewhudson any particular reason for making the last bullet a separate issue?