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• <br />• <br />• <br />Figure 8. Surface Water Magnesium <br />160 <br />190 <br />120 <br />100 <br />.a <br />b, 8 0 <br />E <br />60 <br />40 <br />20 <br />0 <br />Dec-99 <br />Dec-95 Dec-96 <br />--F-TR-A -~-TR-B $TR-C $TR-D <br />Dec-97 <br />160 <br />190 <br />120 <br />100 <br />~ QO <br />E <br />60 <br />90 , • ~ _ <br />0 <br />Dec-67 Dec-88 Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-99 Dec-95 Dec-96 Dec-97 <br />~-TR-A ~-TR-B $TR-C $TR-D <br />13 <br />