---
geometry:
- lmargin=0.9in
- rmargin=0.1in
- tmargin=0.2in
- bmargin=0.5in
- twoside
papersize: a4
classoption:
- twocolumn
...

\begin{figure}[h]
\includegraphics[width=0.8in]{img/graph}
\centering
\end{figure}