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Model        Logistic               
Equation        y = A2 + (A1-A2)/(1 + (x/x0)^p)               
Reduced Chi-Sqr        9.80758               
Adj. R-Square        0.98587               
                Value        Standard Error
B        A1        4.08463        4.94721
B        A2        217573.10184        4.04732E8
B        x0        7.27698E7        2.15451E11
B        p        0.62987        0.32689
B        EC20        8.05571E6       
B        EC50        7.27698E7       
B        EC80        6.57353E8       
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