
\begin{figure}[H]
\newcommand{\wmgd}{1\columnwidth}
\newcommand{\hmgd}{3.0cm}
\newcommand{\mdrd}{figures/monthly-production-of-sulphuric-}
\newcommand{\mbm}{\hspace{-0.3cm}}
\begin{tabular}{c}
\mbm \includegraphics[width=\wmgd,height=\hmgd]{\mdrd/monthly-production-of-sulphuric-_all} \\ = \\

\mbm \includegraphics[width=\wmgd,height=\hmgd]{\mdrd/monthly-production-of-sulphuric-_1} \\ + \\

\mbm \includegraphics[width=\wmgd,height=\hmgd]{\mdrd/monthly-production-of-sulphuric-_2} \\ + \\

\mbm \includegraphics[width=\wmgd,height=\hmgd]{\mdrd/monthly-production-of-sulphuric-_3} \\ + \\

\mbm \includegraphics[width=\wmgd,height=\hmgd]{\mdrd/monthly-production-of-sulphuric-_resid}
\end{tabular}
\end{figure}
