graphics in two columns article

\begin{figure}[ht]
  \centering
  \includegraphics{fig_pdf.pdf}
  \caption{\label{fig:my_fig_label}bla}
\end{figure}




\begin{figure*}[ht]
  \centering
  \includegraphics{fig_pdf.pdf}
  \caption{\label{fig:my_fig_label}bla}
\end{figure*}