How to place two columns of graph on the same page

Please I need someone to help me out with this task. I used the code listing below to achieve the graph shown in Figure1.

\documentclass[12pt,a4paper,notitlepage]{article}
%\documentclass[12pt,a4paper,notitlepage]{report}
\usepackage[numbers, authoryear]{natbib}
\usepackage[english]{babel}
\usepackage{amsmath,amssymb,amsthm,mathtools}
\usepackage{graphicx}
\usepackage{color}
\usepackage{subfig}
\usepackage[a4paper,bindingoffset=0.0in,left=0.7in,right=0.7in,top=0.7in,bottom=0.7in,footskip=0.5in]{geometry}
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{figure}[!ht]
{\begin{minipage}{\dimexpr\linewidth-2.50cm+2.5cm}
\centering
\rotatebox{90}{\makebox[0pt]{{CM Double Differential Cross--section (mb/MeV/sr)}}}
{\begin{minipage}{10.82cm+1cm}%
\raisebox{\dimexpr-.5\height-1em}{\includegraphics[width=10.82cm]{Figures/sum36ho1.eps}}\ \\
\raisebox{\dimexpr-.5\height-1em}{\includegraphics[width=10.82cm]{Figures/sum36ho2.eps}}\ \\
\raisebox{\dimexpr-.5\height-1em}{\includegraphics[width=10.82cm]{Figures/sum36ho3.eps}}\

%% use hspace to center the x-axis lable and then add some space at the end for the subfloat labels.
\vspace*{0.1cm}\hspace*{\fill}{Alpha Particle Energy (MeV)}\hspace*{\fill}%\hspace*{0.5cm}
\end{minipage}}%
%\caption{As in Figure~\ref{fig:sum36sn} but for $^{165}$Ho.}
\caption{}
\end{minipage}}
\end{figure}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}


What modification can I add to the code to allow me include three more charts so that the graph can look like Figure2. Thanks in anticipation.

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Remove \ \ from the end of includegraphics. Every two images leave a line in-between. –  Yiannis Lazarides Mar 20 '13 at 11:30
Put another minipage right after the first one, which contains the other column of graphics. Check that the sum of widths of the minipages does not exceed the allowed \linewidth –  JLDiaz Mar 20 '13 at 11:50
Some suggestions: There's no need to encase the minipage environments in braces. Don't clutter your code with expressions such as {\dimexpr\linewidth-2.50cm+2.5cm}; {\linewidth} will do. Finally, don't load natbib with both the numbers and authoryear options. They're mutually exclusive options; the last-mentioned option will "win". –  Mico Mar 20 '13 at 11:59
Thanks so people! I would be very grateful if you can give me the exact codes (that renders properly) that will help me achieve this task as I seem not to get the correct result when I tried your suggestions. You can use the usual dark boxes to represent the plots in the code. Your prompt response is highly needed. Thank you. –  Fizzle Mar 20 '13 at 12:31

Here is simplified code producing the requested output.

\documentclass[12pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage{amssymb,amsthm,mathtools}
\usepackage{graphicx}
\usepackage[a4paper,bindingoffset=0in,margin=0.7in,footskip=0.5in]{geometry}
\begin{document}

\begin{figure}[htp]
\begin{minipage}{0.95\linewidth}
\centering
\rotatebox{90}{\makebox[0pt]{{CM Double Differential
Cross--section (mb/MeV/sr)}}}
\newlength{\figwidth}
\setlength{\figwidth}{0.4\linewidth}
\begin{minipage}{\figwidth+1cm}%
\centering
\includegraphics[width=\figwidth]{example-image-a}\\
\includegraphics[width=\figwidth]{example-image-a}\\
\includegraphics[width=\figwidth]{example-image-a}\\
Alpha Particle Energy (MeV)
\end{minipage}
\begin{minipage}{\figwidth+1cm}%
\centering
\includegraphics[width=\figwidth]{example-image-b}\\
\includegraphics[width=\figwidth]{example-image-b}\\
\includegraphics[width=\figwidth]{example-image-b}\\
Beta Particle Energy (MeV)
\end{minipage}
\caption{A caption}
\end{minipage}
\end{figure}

\end{document}


Notes:

• I do not have your images so I have used standard ones from the distribution.

• I have introduced a newlength \figwidth to hold the desired width of the figures

• All \raisebox commands have been removed

• \centering has been used for horizontal alignment in each column

• I have assumed the aspect ratio of all your figures is the same

• Dimension expressions have been simplified, and unnecessary nesting of groups removed

• mathtools loads amsmath, so loading the latter is not necessary

• margin sets all four margins for geometry in one go

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