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and download the most recent data, probably something like 2011 or
2012. Since the average values are centered at the date, you need also
the files for preceeding and succeding years. To compute the 2010 mean values,
for instance, the 2009 and 2011 files are also required. These files
shall be renamed so as to include a ".dat" extension. The program
allows you to input the year of computation, as well as all the
required information needed to run it properly. You should b