Problem with subfig and pgfplots' graphs

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]

table[x index=1,y index=3] {Data/magnus_nog_not_dt0.1s.dat};

\legend{}
\end{axis}

\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]

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.

-
If they don't fit, they don't so maybe make them smaller with width=0.4\textwidth ? –  percusse Oct 6 '12 at 20:31
@percusse The graphs are small, so I don't want to make them even smaller. In addition, I want all my graphs look the same way... ;) –  R. M. Oct 6 '12 at 20:40
Yes but what do you expect from us then? The question is not answerable because there is not much else to do. –  percusse Oct 6 '12 at 20:53
@percusse Maybe there is some configuration of subfig that permit to the environment to exceed \textwidth... No? There is anything to do? –  R. M. Oct 6 '12 at 21:00
@R.M. So you want the graphs side by side, no matter if they exceed the margins? If that's so, then perhaps my answer could be useful. –  Gonzalo Medina Oct 6 '12 at 21:14

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

\end{document}


-
That's what I need, thank you. The problem now is that it seems the \\ command is ignored: the 4 graphs are placed in a single line instead of two lines... How I can fix that? –  R. M. Oct 6 '12 at 21:23
@R.M. Sorry but how can we anticipate four graphs in two rows when you only mentioned two graphs in your question? Anyway, the idea is the same: you can use two \makeboxes (one for each row); I'll update my answer with an example. –  Gonzalo Medina Oct 6 '12 at 21:35
@R.M. I've updated my answer. –  Gonzalo Medina Oct 6 '12 at 21:37
Sorry! I posted an old version of my code! –  R. M. Oct 6 '12 at 21:38
@R.M. No problem; just make sure to provide precise information in your questions ;-) Did my updated answer helped? –  Gonzalo Medina Oct 6 '12 at 21:40