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Cross Plot 4 = Rate of Natural <br /> Attenuation <br /> 500 <br /> -- 400 <br /> MW-6 <br /> 300 ® MW-7 <br /> = 200 <br /> MW-8B <br /> Power (MVV-6) <br /> 100 _ s . <br /> 0 <br /> 10 100 <br /> Years <br />