http://en.wikipedia.org/wiki/Scatter_plot
A scatter plot uses cartesean coordinates to display any number of points as they relate to two variables, charted along the x and y axis. They are used for a finite data sets that have most likely not been taken regularly as a function of time. The plot below is a good example of a scatter plot, because it shows it's power as a tool for determining the flow of a set of data and makes that suggested correlation easily digestible for the reader.
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