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~.J <br />PONQ 89 Na, (Dissolveda <br /> <br />mg/1 <br />20 <br />18 <br />16 <br />14 <br />12 <br />10 <br />8 <br />6 <br />4 <br />2 <br />0 <br />^ MIN. <br /> <br />® MEAN <br />MAX. <br />v'i,..F~",`~ 4:: ~.~ w ~:LGi. rSP.~.a~Vtet ;. '.~ i4~_~~' ~"cs3'~'~i6r'cry`~~e3.f~3.taedin'o`ic.~.:~„ ~'~ ..., r,.ue,..., . e. .. <br />1987 1986 1985 1984 1983 <br />