Table 2 Description of the regression variations compared in this work.

Ŝ_{1-Step_linear}

standard linear regression

lm(MM40 ~ S)

N/A

Ŝ_{1-Step_Deming}

Deming regression

deming(MM40 ~ S)

N/A

Ŝ_{2-Step_linear}

standard linear regression; the standard Centiloid project approach

lm(MM40 ~ MM50)

lm(MM50 ~ S)