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

Values for calculation

$n_i$
$I_i$
$π$
$τ$
$J_i$
$\text{Region}$

Calculation

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

$\text{if }\ \text{Region}= 1$
$$γ_π=\sum_{i=1}^{34}{-n_i\cdot I_i\cdot\left(7.1-π\right)^{I_i-1}\cdot\left(τ-1.222\right)^{J_i}}$$
$\text{else}$
$$γ_π=0$$