Present Visually Useful and Attractive Summary of Large Data 
            Use SYSTAT's Hexagonal Binning, a form of bivariate histogram, for an   advanced version of scatterplot for large data sets. Hexagonal binning plots   divide the screen on a hexagonal grid. The radius of the hexagons is the same   throughout but its color depends on the range of the frequency of the x-y   values. 
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