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<br />' Figure 8. Surface Waler Magnesium <br />i~ <br />180 <br />160 <br />190 <br />120 <br />,~ 100 <br />b <br />fi 80 <br />60 <br />90 <br />20 <br />0 <br />Dec-97 <br />~~~ ~---p <br />Dec-98 Dec-99 Dec-00 <br />fTR-A ~-TR-B QTR-C QTR-D <br />180 <br />160 <br />140 <br />120 <br />,~ 100 <br />rn <br />fi 60 <br />60 <br />40 ~ e <br />20 FN ~ F~ F~ Hy ~'~ ~_ <br />0 <br />Dec-90 Dec-91 Nov-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 Dec-00 <br />tTR-A -QTR-B t TR-C QTR-D <br />iz <br />