\documentclass[letterpaper,titlepage,12pt]{article}

\setlength{\topmargin}{0in}

\setlength{\oddsidemargin}{0in}

\setlength{\evensidemargin}{0in}

\setlength{\textwidth}{6.5in}

\setlength{\textheight}{9in}

\setlength{\headheight}{0in}

\setlength{\headsep}{0in}

\setlength{\marginparsep}{0in}

\setlength{\marginparwidth}{0in}

\renewcommand{\baselinestretch}{1.0}

\newcommand{\etal}{\emph{et al.}}

\newcommand{\degr}{^{\circ}}

\usepackage[dvips]{graphics}

\usepackage{epsf}

\input psfig