\documentclass[twocolumn]{revtex4}
\usepackage{graphicx}
\begin{document}

\title{An example of ReVTeX4}
\author{D.V.~Fedorov}
\affiliation{IFA, Aarhus University}
\begin{abstract}
A short example of RevTex usage.
\end{abstract}
\maketitle

\section{Introduction}
Hello world.
Here is some math: $\alpha^2=\beta^2+\gamma^2$.
	\begin{equation}\label{eq:a}
\frac{\partial}{\partial x}y = y \,.
	\end{equation}

This equation has number~(\ref{eq:a}).

One more random equation:
	\begin{equation}\label{eq:r}
\mathrm{erf}(x) = \frac{2}{\sqrt\pi}\int_0^x e^{-t^2} dt \,.
	\end{equation}

\section{Figures}

\begin{figure}[b]
\includegraphics{fig1.pdf}
\caption{Error function $\mathrm{erf}(x)$.}
\label{fig:erf}
\end{figure}
This figure is numbner~\ref{fig:erf}

\begin{figure}[b]
\input{fig2.tex}
\caption{Complementary frror function $\mathrm{erfc}(x)$.}
\label{fig:erfc}
\end{figure}
This figure is numbner~\ref{fig:erfc}


\end{document}
