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<br />• <br />e <br />~1 <br />~ ~ 31i• <br />~ 21°l <br />LiL <br /> ` <br />/~ <br /> <br />_ a i <br />~ n l <br />M r ~. .r ~f M <br />d 8 n ~• ' <br />, <br />f <br />J ~ \ <br />' <br />~ `~ ~ ~ 1 t ~ E <br />d~ <br />~ <br />1 <br /> t <br />~ <br />1 ,. f 'b A F7 <br /> f <br />' <br /> i :I ~~ <br />~~.:A/ <br />? <br />\ <br /> . <br />Y i <br />Y <br />~ :'1.~ /~': ~ / <br /> ~ACd'd11Uy <br /> <br />r1 <br />~J <br />Figure 7 Typical mining panel r:ith subsidence trough <br />(DELTA- angle of draw; Sm - ma::imum subsidence) <br />