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<br />i~1 V JLt~1 V ~~~~~ 1'~~~1 V <br />~~~'U 1 V ~~~~~ ~t~L4 <br />z <br />0 <br />a <br />0 <br />~a <br />1984 1985 1986 1987 1988 1989 <br />SPMPLING PERIOD <br />70 <br />60 <br />50 <br />40 <br />30 <br />20 <br />10 <br />n <br />-f <br />WF1L <br />-~ -- <br />1 <br />- <br />WF71 <br />-~.- 1 A <br />- <br />WE~1.. <br />---+- 1 B <br />- <br />W~1.. <br />---~ 1 C <br />-- <br />WELL 7 <br />