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1.0 <br />0.9 <br />0.8 <br />0.7 <br />0.6 <br />.-. <br />N <br />U <br />~ 0 0.5 <br />~ N <br />7 <br />O <br />F 0.4 <br />.~ <br />0.3 <br />0.2 <br />0.1 <br />0.0 <br />NORTH GOODSPRING WELL <br />MG <br />YEAR <br />^ MG <br />1990 1992 <br />