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\begin{figure}[h]
\begin{minipage}[c]{.46\linewidth}
\centering
\includegraphics{mon_image}
\end{minipage}
\hfill%
\begin{minipage}[c]{.46\linewidth}
\centering
\includegraphics{mon_image2}
\end{minipage}
\end{figure}
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\begin{figure}
\centering
\begin{subfigure}[b]{0.4375\textwidth}
\centering
\includegraphics[width=\textwidth]{assets/pics/graph1.png}
\caption{$y=x$}
\label{fig:y equals x}
\end{subfigure}
\hfill
\begin{subfigure}[b]{0.4375\textwidth}
\centering
\includegraphics[width=\textwidth]{assets/pics/graph2.png}
\caption{$y=3sinx$}
\label{fig:three sin x}
\end{subfigure}
\caption{Three simple graphs}
\label{fig:three graphs}
\end{figure}
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\documentclass[10pt,a4paper]{article}
\usepackage[demo]{graphicx}
\usepackage{subfig}
\begin{document}
\begin{figure}%
\centering
\subfloat[\centering label 1]{{\includegraphics[width=5cm]{img1} }}%
\qquad
\subfloat[\centering label 2]{{\includegraphics[width=5cm]{img2} }}%
\caption{2 Figures side by side}%
\label{fig:example}%
\end{figure}
\end{document}