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FIGURE 2 <br />Charge Weight Frequency of Occurence <br />Blasting From 9/91 to 5/93 <br />a~ <br />U <br />C <br />N <br />7 <br />U <br />U <br />w <br />O <br />T <br />U <br />C <br />m <br />7 <br />N <br />L <br />