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10.0 <br />9.0 <br />8.0 <br />7.0 <br />6.0 <br />.-. <br />~~ <br />0 0 5.0 <br />= N <br />~ O <br />F 4.0 <br />3.0 <br />2.0 <br />1.0 <br />0.0 <br />UPPER GOODSPRING <br />CONDUCTIVITY <br />o FIELD + LAB <br />1983 1985 1987 1989 1991 <br />YEAR <br />