Table 2 The $\mathit{N}\mathbf{(}{\mathit{M}}_{\mathbf{cp}}\mathbf{,}{\mathit{f}}_{\mathbf{\ast }}\mathbf{)}$ for the different ${\mathit{f}}_{\mathbf{\ast }}$ shapes tested

ax + b

0.616106811666

$a{x}^2+bx+c$

0.628533747603

a log(x)+b

0.623911138356

$a{x}^b$

0.572996769269

$\frac{a}{x}$

0.609588181022

$-\frac{ax+b}{cx+d}$

0.632547410976