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1 <br /> 1 <br /> 1 ❑ Great circle representing the slope face ( • - pole representing the slope face ) <br /> 1 © Great circle representing the rock mass foliation <br /> ® Friction circle N <br /> 1 <br /> 1 <br /> 1 P ' <br /> 1 <br /> P-3 <br /> 1 ° <br /> 1 z <br /> P-t <br /> 1 O P-4 <br /> 1 <br /> O <br /> ■ P-6 <br /> ■ F-6 <br /> i <br /> idf �=rz <br /> 1 Figure 6. Stereonet Plot - North Wall <br /> 1 <br />