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Dissolved Oxygen (mglL) <br /> NP-2 <br /> i <br /> 700 <br /> 600 <br /> 500 - - <br /> i <br /> a 00 <br /> 2V <br /> 300 <br /> ■ <br /> 200 <br /> 100 <br /> 000 <br /> t N P-2-20 -FNP-2-60 --A,--NP-2-1161 <br />