Create bar graph wider [closed]

Question

I created a bar graph using pgfplot and option ybar. I would get a graph wider. I used width option

\documentclass[12pt,a4paper,twoside,openright]{book}

\usepackage{tikz}
\usetikzlibrary{positioning}
\usepackage{pgfplots}



\begin{document}
\begin{tikzpicture}
\begin{semilogxaxis}[ybar,
                             ymajorgrids=true,
                             xlabel=packet loss,ylabel=energia,
                             legend pos = north west]
            \addplot [fill=red!50,draw=red!50!black]
                table [x=pep,y=1]
                {./MATLAB/grafici/energia/broadcast_scenario/energy_broadcast_varpktslossprobability_100nodes.txt};
            \addplot [fill=blue!70, draw=blue!50!black]
                table [x=pep,y=20]
                {./MATLAB/grafici/energia/broadcast_scenario/energy_broadcast_varpktslossprobability_100nodes.txt};
            \addplot [fill=violet!70, draw=violet!50!black]
                table [x=pep,y=50]
                {./MATLAB/grafici/energia/broadcast_scenario/energy_broadcast_varpktslossprobability_100nodes.txt};
            \addplot [fill=orange!50, draw=orange!50!black]
                table [x=pep,y=100]
                {./MATLAB/grafici/energia/broadcast_scenario/energy_broadcast_varpktslossprobability_100nodes.txt};
            \legend{\footnotesize{$1$},\footnotesize{$20$},\footnotesize{$50$},\footnotesize{$100$}}
        \end{semilogxaxis}
    \end{tikzpicture}


\end{document}

but the plot became bigger in height and width. Instead I would have only a wider graph