\documentclass[table]{bmcart}


\usepackage{booktabs} % for e.g. \toprule
\usepackage{tabularx}
\usepackage{graphicx}


\renewcommand{\topfraction}{.85}
\renewcommand{\bottomfraction}{.7}
\renewcommand{\textfraction}{.15}
\renewcommand{\floatpagefraction}{.66}
\renewcommand{\dbltopfraction}{.66}
\renewcommand{\dblfloatpagefraction}{.66}

\newcommand{\chprefix}{A}
\renewcommand\thefigure{\chprefix.\arabic{figure}}

\begin{document}

\setcounter{figure}{2}
\begin{figure}[ht!]
\centering
\includegraphics[width = 0.99\textwidth]{plots/D2_Duration_Stay_inclPostlasso.pdf}
\caption{MSE (mean and standard error bars) for the COPD data set and the DV \emph{Duration Stay} for classic and post-LASSO respectively.}
\end{figure}


\end{document}