ft(\frac{Pe}{Ptmfp_{In}}\right)^{\frac{1-\gamma}{\gamma}}-1\right]}  $$

    In the previous equation, <i>Ptmfp<sub>In</sub></i> is the total pressure
    of the main path flow, as determined by the input gas path characteristics.
</p>
<p>
    The throat to critical area ratio is determined by the following:

    $$\textit{Ath_o_Acr} = \frac{\textit{Ae_o_Acr}*Ath}{\textit{s_V_Ae_vlv}}$$

    in which <i>s_V_Ae_vlv</i> is specified by the user and can be accessed
    by double clicking the block and editing 