Problem with subfig and pgfplots' graphs

Question

I have a problem with the subfigenvironment. My two graphs created with pgfplots are too large to stay together. How can I fix that?

% Graphique
\begin{figure}
\centering
\subfloat[]{$\tau = \SI{0.1}{\second}$}
    {\begin{tikzpicture}
    \begin{axis}[title={Trajectoire de la balle dans le plan $x$-$z$}, xlabel={$x$}, ylabel={$z$},%
    legend cell align=left]

        \addplot[red,thick,each nth point={10}]
            table[x index=1,y index=3] {Data/magnus_nog_not_dt0.1s.dat};

        \legend{}
    \end{axis}
    \end{tikzpicture}} \quad

\subfloat[]{$\tau = \SI{0.001}{\second}$}
    {\begin{tikzpicture}
    \begin{axis}[title={Trajectoire de la balle dans le plan $x$-$z$}, xlabel={$x$}, ylabel={$z$},%
    legend cell align=left]

        \addplot[red,thick,each nth point={10}]
            table[x index=1,y index=3] {Data/magnus_nog_not_dt0.001s.dat};

        \legend{}
    \end{axis}
    \end{tikzpicture}}

    \caption[]{}\label{g:nognot}
\end{figure}
% Graphique

Ps: I didn't provide a MWE because you need files to compile my graphs.

Answer 1

From the comments it seems that was is required is a method to have the two graphs in the same row, no matter if the margins are exceeded; one way to achieve this is using a \makebox:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows,calc,positioning}
\usepackage{subfig}
\usepackage{lipsum}

\begin{document}

\lipsum[2]
\begin{figure}
\centering
\makebox[\textwidth][c]{%
\subfloat[]{%
  \begin{tikzpicture}
  \draw (0,0) grid (7,3);
  \end{tikzpicture}}\quad
\subfloat[]{%
  \begin{tikzpicture}
  \draw (8,0) grid (15,3);
  \end{tikzpicture}}
}\\
\makebox[\textwidth][c]{%
\subfloat[]{%
  \begin{tikzpicture}
  \draw (0,0) grid (7,3);
  \end{tikzpicture}}\quad
\subfloat[]{%
  \begin{tikzpicture}
  \draw (8,0) grid (15,3);
  \end{tikzpicture}}
}
\caption[]{}
\label{g:nognot}
\end{figure}

\end{document}