I'm using the geoChart (US, resolution:metro), and have it working with two columns of data (string(region), and number. I wanted to add a third column of data (string), but it's not showing in the mouseover tooltip like the others. The geochart example says the string (region) is required, and there are two optional. I'm wondering why my 2nd optional isn't showing, and is there really a 2 extra column limit to each entry?
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