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i <br /> Graph 7 <br /> Hydrogaph <br /> Fon ner BP Oil 11192 <br /> -612 <br /> -1112 - Aoo <br /> --o—mw-9 <br /> �-S-1 <br /> 'r0 �S-2 <br /> —X—S-3 <br /> v <br /> -1612 —X—S4 <br /> —o—S-5 <br /> b <br /> -2112 <br /> -2612 <br /> Apr-90 Jan-93 Oct-95 JUI-98 Apr-01 Jan-04 <br /> T mue <br /> I <br /> I <br /> A <br />