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\begin{figure}[H]\begin{minipage}[b]{0.5\linewidth}\centering\includegraphics[width=0.7\textwidth]{shapesrs1}\subcaption{Example foundation with \(R=\frac{1}{\pi} \approx 0.32\)}\end{minipage}\begin{minipage}[b]{0.5\linewidth}\centering\includegraphics[width=0.7\textwidth]{shapesrs2}\subcaption{\(\left. R_{RSmax}=\frac{B_{i}^2}{\pi r_{o}^2}\right\vert_{r_{o}=\frac{\sqrt{2}B_{i}}{2}}=\frac{2}{\pi}\approx0.64\)}\end{minipage}\caption{Ring foundations with central square perforation}\end{figure}
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