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Boston Marathon Finish Times, Year after Year

Finish times vs. number of runners in the Bostom Marathon, year over year. Darker means that more people ran times in that hour range, which is specified in the y axis.

This is related to the buzz about slow runners in marathons. There is definitely an expansion in the >4hr set as the data goes on. The limited results in 2013 are, of course, because of the Boston Marathon bombings.

Uses Bill Mill's processed data.