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Figure 7. Surface Prater Calcium <br />• <br />250 <br />200 <br />150 <br />f, <br />E <br />100 <br />50 <br />0 {-- <br />Dec-95 <br />• <br />250 <br />200 <br />Dec-98 <br />150 <br />rn <br />E <br />100 QQQ.~~~~Qppp. <br />50 ~ ~ ~ <br />0 <br />Dec-BB Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 <br />i-TR-A -QTR-B -QTR-C QTR-D <br />• <br />12 <br />Dec-96 Dec-97 <br />fTR-A -~TR-B -F TR-C -0-TR-D <br />