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r <br /> <br /> <br />• • <br />~. <br />-10- <br />TABLE 3. Percent extraction for retreat pillar sizes. <br />Pillar <br />Size <br />ft <br />12x80 <br />14x80 <br />15x80 <br />16 x 80 <br />18 x 80 <br />20 x 80 <br />12 x 100 <br />14 x 100 <br />15 x 100 <br />16 x 100* <br />18 x 100 <br />20 x 100 <br />Tributary <br />Area <br />ft) <br />50 x 100 <br />50 x 100 <br />50 x 100 <br />50 x 100 <br />50 x 100 <br />50 x 100 <br />60 x 120 <br />60 x 120 <br />60 x 120 <br />60 x 120 <br />60x120 <br />60 x 120 <br />*Most probable values for Panel G. <br />Percent <br />Extraction <br />cx) <br />80.8 <br />77.6 <br />76.0 <br />74.4 <br />71.2 <br />68.0 <br />83.3 <br />80.6 <br />79.2 <br />77.8* <br />75.0 <br />72.2 <br />2nd East and <br />3rd East Panels <br />Panel G <br /> <br />