\documentclass[fleqn, usenatbib, useAMS, a4paper]{mnras}
\usepackage{graphicx}
\usepackage{amsmath,paralist,xcolor,xspace,amssymb}
\usepackage{times}
\usepackage{comment}

\newcommand{\gadget}{{\sc Gadget}\xspace}
\newcommand{\swift}{{\sc Swift}\xspace}
\newcommand{\nbody}{$N$-body\xspace}

%opening
\title{FMM in SWIFT}
\author{Matthieu Schaller}
\begin{document}

\date{\today}

\pagerange{\pageref{firstpage}--\pageref{lastpage}} \pubyear{2014}

\maketitle

\label{firstpage}

\begin{abstract}
Making gravity great again.
\end{abstract}

\begin{keywords}
\end{keywords}

\section{Gravity in \swift}
\label{sec:gravity}

\input{potential_softening}
\input{fmm_summary}
%\input{gravity_derivatives}
\input{mesh_summary}

\bibliographystyle{mnras}
\bibliography{./bibliography.bib}

\appendix
\input{vector_notation}
\onecolumn
\input{potential_derivatives}


\label{lastpage}

\end{document}
