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((1 - 0.9^2)^-0.5 - 1) * c^2 * 0.9 * c * (1*0.9 + 4*0.1) amu/cm^3
((1 - 0.9^2)^-0.5 - 1) * c^2 * 0.9 * c * (1*0.9 + 4*0.1) amu/cm^3
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