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• <br />• <br />N <br />T <br />N <br />LL_ <br />m <br />N <br />rn <br />d <br />O <br />H <br />8000 <br />6000 <br />4000 <br />2000 <br />0 <br />Figure 10. Total Degree Days, Jan. to June* <br />(1987 to 1990) <br /> Peabody Seneca II Mine <br /> m <br />~ <br />N m <br />~ <br />~ <br /> m <br />m m <br />m rn m <br />m <br /> ~ <br />o O m > <br /> <br />m ~ ~ <br />~ ~ ~ <br />m <br /> <br /> <br />U C ~ <br />m <br />V ~ ~ <br /> <br />N (p <br /> ~ ~ <br />a C N <br /> <br />U Q <br /> m <br />~ N <br />~ U <br />` m <br /> m <br />a a <br />rn <br /> ~ <br />m r <br />1987 1988 1989 1990 Avg <br />• <br />Year <br />'Based on Nat. Oc. & Atm. Adm. data from Hayden, CO <br />31 <br />