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A-6 <br />u <br />m <br />h <br />0 <br />c <br />m <br />5000 <br />3750 <br />2500 <br />1250 1 _r, / <br />0 <br />01/83 01/85 <br />O Lab Conductivity <br />01/87 01/89 01/91 <br />01/93 01/95 01/97 <br />Date <br />