\documentclass[11pt,letterpaper]{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{subfigure}
\author{M. Andy Kass et al.}
\title{Supplementary material}
\begin{document}
\maketitle

\begin{figure}
\includegraphics{S01_combined}
\caption{Soil freezing models for three stages of freezing using the inverse pore freezing model.  In this model, ice freezes from the pore walls toward the centers.}
\end{figure}


\begin{figure}
\includegraphics{S02_combined}
\caption{Observed (points) and predicted (line) data for progressively frozen models, corresponding to progressive depths in AK204-ROAD.  This is the inverse freezing model, where ice aggrades from the pore walls towards the centers.  Note how the model is completely unable to fit the data.}
\end{figure}

\end{document}
