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y = (100/(1+10^(6.35– x))) and y = 100 - (100/(1+10^(6.35– x))), x from 4.2 to 8.5
y = (100/(1+10^(6.35– x))) and y = 100 - (100/(1+10^(6.35– x))), x from 4.2 to 8.5
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