A Tukey box plot. The red circle shows the median value, the red box shows the outline for the middle 2 quartiles, the red dashed lines shows the points within 1.5 times the 25-75 quartile range of the median, and red dots indicate outliers. The blue circle shows the mean value and the blue angle brackets show the standard deviation.

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This picture was obtained from Matt Ward's XmdvTool home page.