Point 1

Point 2

Point 3

Point 4

$y=0.0571\ln \left(x\right)-0.0588$

$y=30.479\ln \left(x\right)-138.65$

$y=0.071\ln \left(x\right)+72.9$

$y=1.0426\ln \left(x\right)+62.873$

R² = 0.99

R² = 0.97

R² = 0.62

R² = 0.43