\documentclass[11pt]{article}
\usepackage{multicol}
\usepackage{graphicx}
\usepackage[spanish]{babel}

% This is the LaTeX sample. If you use this sample you automatically get 
%the correct formatting of your Abstract.


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\newcommand{\abstracttext}[1]{\vspace{0.5cm}\columnsep0.75cm \begin{multicols}{2} #1 \end{multicols}}
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\begin{document}


\abstracttitle{INSTRUCCIONES PARA LA PREPARACI\'ON DE LOS 
RESUMENES  \\
SEGUNDA L\'INEA}


\authors{Autor One$^\ast$, Autor Two$^\dag$ and so on}

\addresses{
$^\ast$Departamento de F\'{\i}sica, FCEYN -- Universidad de Buenos Aires,
Buenos Aires, Argentina \\
$^\dag$Instituto de Astronom\'{\i}a y F\'{\i}sica del Espacio, 
Buenos Aires, Argentina}


\abstracttext{ 

Este es un ejemplo de resumen para la Conferencia DCM, en 
Buenos Aires.
A continuaci\'on se presentan las instrucciones para su confecci\'on.

1. Abstracts can be written in any language. The length of each
abstract is strictly limited to one page. The abstract should be
submitted in pdf-format (recommended) or postscript--format through
the conference web site. 

2. Abstracts should be in A4 format (210 mm $\times$  297 mm, i.e.
8.268 inches $\times$  11.693 inches). All text and figures have
to fit within side margins of 2.4 cm and top and bottom margins of
2.4 cm. Use the 11 pt Roman font (Roman is the default LaTex font)
or a similar font such as Times New Roman throughout the whole
Abstract.

3. The title should be typed in all capital letters and centered.
If necessary, use a second line, single-spaced just below the
first.

4. Leave two lines before the names of the authors  and again
before the single--spaced affiliations and addresses.

5. After leaving three lines, the body text is typed in a two
column format with a 0.75 cm column spacing. The text should be
single spaced and the first line of each paragraph should be
indented 5 spaces.


6. The maximum size of each Abstract is 30 Mb.

\vspace{2cm} 

\begin{center}
\includegraphics[width=3.75cm,angle=-0]{totwaveprop_0001.eps}
%\hspace{0.1cm}
\includegraphics[width=3.75cm,angle=-0]{totwaveprop_0002.eps}
%\hspace{0.1cm}
\vspace{0.1cm}
\includegraphics[width=3.75cm,angle=-0]{totwaveprop_0003.eps}
%\hspace{0.1cm}
\includegraphics[width=3.75cm,angle=-0]{totwaveprop_0004.eps}
%\vspace{2pt}
\label{fig:snapshots}
\capt{1}
{Snapshots of the wave function
amplitude $|\Phi_{2s^2}({\bf r}_1,{\bf r}_2,t)|$
at different times during the autoionization process\cite{Mitnik:04}.}
\end{center}

7. References in the text should be indicated using numbers in
brackets~\cite{AIP93}. The list of references follows the last
line of the text with one extra line inserted. Follow the Style of
the American Institute of Physics~\cite{AIP93}, as used in
Physical Review. Standard Latex adds an empty line between references.
If you want to avoid this add a negative space after each reference
(remove the \%-sign before the vspace-command after the reference below).


\begin{thebibliography}{99}
\bibitem{AIP93} See AIP  Style and Notation Guide
http://publish.aps.org/STYLE/ 
(American Institute of Physics, New York, 1993)
\bibitem{Mitnik:04} 
Author, 
Phys. Rev. A {\bf 70}, XXXXXX (2004).
%\vspace{-0.4cm}
\end{thebibliography}

}

\end{document}
