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• Figure 10. Total Degree Days, Jan. to June ' <br /> Peabody Seneca II Mine <br /> 8000 <br /> 6000 <br /> N <br /> 0 � <br /> LL � <br /> d N O m <br /> 0 4000 > m ro <br /> • m <br /> ,a > <br /> CD <br /> F O <br /> > <br /> Q <br /> OD y c <br /> 2 Um <br /> a <br /> (1 <br /> 2000 <br /> 0 <br /> 1987 1988 1989 Avg <br /> Year <br /> • Based on Nat. Oc. & Alm. Adm. data from Hayden, CO <br /> 30 <br />