Distinguished colleagues, good afternoon.
How can I make the elements of the first column in vertical alignment with the center of the rows?
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\begin{figure}[!ht]
\centering
\begin{tabular}{ccccccc}
$R a_{L_{P}}$ & \begin{tabular}[c]{@{}c@{}}$r=1.00$\ (Reference Geometry)\end{tabular} & $r=1.05$ & $r=1.10$ & $r=1.20$ & $r=1.50$ & \begin{tabular}[c]{@{}c@{}}$r=1.50$\ (Convex Profile)\end{tabular} \
$3\cdot10^{6}$ & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-1.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-4.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-7.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-10.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-13.png} & \includegraphics[width=0.1425\linewidth]{Figuras/Figuras2/14-16.png} \
$7\cdot10^{6}$ & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-2.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-5.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-8.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-11.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-14.png} & \includegraphics[width=0.1425\linewidth]{Figuras/Figuras2/14-17.png} \
$1\cdot10^{7}$ & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-3.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-6.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-9.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-12.png} & \includegraphics[width=0.12\linewidth]{Figuras/Figuras2/14-15.png} & \includegraphics[width=0.1425\linewidth]{Figuras/Figuras2/14-18.png}
\end{tabular}
\caption{2D schematic visualization of the flow lines over the plates with rectangular corrugations with (a) $r=1.00$ (Reference Geometry), (b) $r=1.50$ e (c) $r=1.50$ (Convex Profile)).
Source: Authors' own work.}
\label{fig:Fig14}
\end{figure}
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