A scale that goes from green to red? I'm unable to discern the difference between colors evenly spaced on either side of the middle line.
Mousing over to see change does help. Perhaps instead of simply colors (please, designers, don't rely on color alone to convey information. Think of the chil^H^H^H^H color blind individuals) you could have patterns for the fills.
Mousing over to see change does help. Perhaps instead of simply colors (please, designers, don't rely on color alone to convey information. Think of the chil^H^H^H^H color blind individuals) you could have patterns for the fills.