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Derivative of $γ^r$ with respect to the dimensionless pressure $π$

Values for calculation

$n$
$I$
$π$
$τ$
$J$
$\text{Region}$

Calculation

Derivative of $ γ^r $ with respect to the dimensionless pressure $ π $

$\text{if }\ \text{Region}= 2$
$$γ^r_π=\sum_{i=1}^{43}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot\left(τ-0.5\right)^{J[i]}}$$
$\text{else if }\ \text{Region}= 5$
$$γ^r_π=\sum_{i=1}^{6}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot τ^{J[i]}}$$
$\text{else}$
$$γ^r_π=0$$