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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Figure 10. Surface Waler Bicarbonate <br />300 <br />250 <br />200 <br />.i <br />~ 150 <br />E <br />100 <br />50 <br />0 <br />Dec-96 <br />Dec-97 Dec-98 <br />fTR-A -t-TR-B QTR-C -QTR-D <br />Dec-99 <br />500 <br />950 <br />400 <br />350 <br />300 <br />ti <br />~ 250 <br />E <br />200 <br />150 <br />100 <br />50 <br />D <br />Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-99 Dec-96 Dec-96 Dec-97 Dec-98 Dec-99 <br />fTR-A -QTR-B QTR-C QTR-D <br />IS <br />