This graph provides a snapshot of changes in ice extent for the last four
months. The graph shows a time series for the Southern hemisphere (solid blue line). The graph also includes a comparison line for the 1981 through 2010 average (solid grey line) that is plotted for the previous four months as well as the upcoming month. The light gray area around the 1981-2010 average line shows the two standard deviation range of the data. The graph also includes lines for selected earlier years, for comparison (dashed dark blue line).
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