Well, I'm using this to generate my graph.tex and graph.eps files from gnuplot:
set terminal epslatex input color colortext size 11.6cm, 8.5cm solid linewidth 2
But when I use
\begin{center}
\begin{figure}[h]
\input{graph}
\end{figure}
\end{center}
the text is centered but the image is not (it is a little bit up and to the right). Here's what it produces

I already tried changing the order of the center and figure environments and putting the [htp] option instead of just [h].
How can I fix this?
Thanks for reading!
\fbox{\input{graph}}to see the margins. And you don't need to use a floating environment with beamer. Just use\begin{center}\input{graph}\end{center}or aminipage. – Christoph May 14 '14 at 09:51\fboxpreceding the\input. What I see is a margin that seems to be the page margin and the margins of the gnuplot image are deslocated with respect to these (they are a little up and to the right)... Thanks very much for your attention! – Larara May 14 '14 at 09:59