Box plots are used by many to show variation and the location of information in a set of data and are great tools when comparing various things like energy output like the plot above. It graphs the energy output of four machines showing that machine three is significantly ahead of the others. These bowes show the range each machine reaches since not every trial will come out with the same results.
http://itl.nist.gov/div898/handbook/eda/gif/boxplot0.gif
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