Lines 2177 to 2181 must be placed after line 2183.
\begin{equation}
w \equiv \begin{cases} I_{\mathbf{b}}[\boldsymbol{\mu}{\mathrm{pc}}] & \text{if} \quad \boldsymbol{\mu}{\mathrm{pc}} < \lVert I_{\mathbf{b}} \rVert\
\text{\small STOP} & \text{otherwise}
\end{cases}
\end{equation}
where: