I am new to Latex and trying to build an article in it. I intend to put multiple charts (6 in one single page). I wrote the following code :
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\begin{figure}
\begin{subfigure}{\textwidth}
\includegraphics[width=0.40\linewidth]{Fig4corr1.pdf}
\end{subfigure}%
\begin{subfigure}{\textwidth}
\includegraphics[width=0.40\linewidth]{Fig4corr2.pdf}
\end{subfigure}
\begin{subfigure}{\textwidth}
\includegraphics[width=0.40\linewidth]{Fig4corr3.pdf}
\end{subfigure}%
\begin{subfigure}{\textwidth}
\includegraphics[width=0.40\linewidth]{Fig4corr4.pdf}
\end{subfigure}%
\begin{subfigure}{\textwidth}
\includegraphics[width=0.40\linewidth]{Fig4corr5.pdf}
\end{subfigure}%
\begin{subfigure}{\textwidth}
\includegraphics[width=0.40\linewidth]{Fig4corr6.pdf}
\end{subfigure}%
\caption{Correlation Matrices of the variables}
\footnotesize Notes on Graphs in Figure 4: The distribution of each variable is shown on the diagonal. On the bottom of the diagonal: the bivariate scatter plots with a fitted line are displayed. On the top of the diagonal: the value of the correlation plus the significance level as stars. Each significance level is associated to a symbol: p-values (0, 0.001, 0.01, 0.05, 0.1, 1) <=> symbols ("***", "**", "*", ".", " ")
\end{figure}
subfigure