\begin{equation}
\begin{array}{c}
\overbrace{\qquad \qquad \qquad \qquad \qquad }^{\text{a}} \\
\begin{array}{c}
&\text{b} \\ &i_\infty \\ &\uparrow \\ &i_{f0} \\& \text{c}
\end{array}
\qquad \qquad
\begin{array}{c}
&\text{d} \\ &\Delta i' = i' -i_\infty \\ &\uparrow \\&i_\infty \\& \text{e}
\end{array} \\
\underbrace{\qquad \qquad \qquad \qquad \qquad }_{\text{f}}
\end{array}
\qquad \qquad
\begin{array}{c}
\overbrace{\qquad \qquad}^{\text{g}} \\
\begin{array}{c}
&\text{h} \qquad \text{i} \\
&i_{ap} \; \longrightarrow \; i_{2\omega} \\ & \nwarrow \quad \nearrow \\ & \Delta i_\omega \\& \text{j}
\end{array} \\ \\
\quad \text{k}
\end{array}
\end{equation}
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