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� psi <br />I <br />1 2000 <br />1800 <br />1600 <br />Figure 15. Vertical stress distribution on the Upper B Seam. <br />400 <br />1200 <br />1000 <br />1 800 <br />600 <br />400 <br />200 <br />Safety factor <br />I\ <br />75 <br />Figure 16. Pillar factor -of -safety for the mains. <br />u <br />Technologies, Inc. <br />Page 30 <br />Seale, R <br />-_ <br />0 500 1000 1500 2000 <br />Style, It <br />0 500 1000 1500 2000 <br />