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+\documentclass[10pt]{letter}
+\usepackage{UPS_letterhead,xcolor,mhchem,mathpazo,ragged2e}
+\newcommand{\alert}[1]{\textcolor{red}{#1}}
+\definecolor{darkgreen}{HTML}{009900}
+
+
+\begin{document}
+
+\begin{letter}%
+{To the Editors of the Journal of Chemical Theory and Computation}
+
+\opening{Dear Editors,}
+
+\justifying
+Please find enclosed our manuscript entitled
+\begin{quote}
+\textit{``A Density-Based Basis Set Correction for GW Methods''}, 
+\end{quote}
+which we would like you to consider as a Regular Article in the \textit{Journal of Chemical Theory and Computation}.
+This contribution nicely fits in the \textit{``Quantum Electronic Structure''} section.  
+
+One of the most fundamental drawbacks of conventional electron correlation methods is the slow convergence of energies and properties with respect to the one-electron basis set.
+Similar to other electron correlation methods, many-body perturbation theory methods based on Green functions, such as the so-called $GW$ approximation, suffer from the same pathological slow convergence.
+As proposed by Kutzelnigg more than thirty years ago, one can introduce explicitly the interelectronic distance $r_{12}$ to significantly speed up the convergence.
+However, significant computational overheads are introduced by the large auxiliary basis used to resolve three- and four-electron integrals.
+Moreover, to the best of our knowledge, a F12-based correction for $GW$ has not been designed yet.
+In this manuscript, we describe a drastically different approach which combines density-functional theory (DFT) and Green function based methods.
+The present universal, density-based basis set incompleteness correction relies on short-range correlation density functionals from range-separated DFT to estimate the basis set incompleteness error.
+The performance of this density-based correction is illustrated by computing the ionization potentials of molecules of the GW100 test set at the perturbative GW level.
+In particular, we evidence that the present basis set correction significantly speeds up the convergence of ionization potentials for small and larger molecules towards the complete basis set limit. 
+
+We suggest Xavier Blase, Lucia Reining, Timothy Berkelbach, Michel van Setten,Patrick Rinke, Valerio Olevano, Seiichiro Ten-no, Wim Klopper, and David Tew as potential referees.
+This contribution has never been submitted in total nor in parts to any other journal, and has been seen and approved by all authors.
+We look forward to hearing from you.
+
+\closing{Sincerely, the authors.}
+
+
+\end{letter}
+\end{document}
+
+
+
+
+
+
diff --git a/Cover_Letter/UPS_letterhead.sty b/Cover_Letter/UPS_letterhead.sty
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+++ b/Cover_Letter/UPS_letterhead.sty
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+%ANU etterhead Yves
+%version 1.0	12/06/08
+%need to be improved
+
+
+\RequirePackage{graphicx}
+
+%%%%%%%%%%%%%%%%%%%%% DEFINE USER-SPECIFIC MACROS BELOW %%%%%%%%%%%%%%%%%%%%%
+\def\Who     {Pierre-Fran\c{c}ois Loos}
+\def\What    {Dr}
+\def\Where   {Universit\'e Paul Sabatier}
+\def\Address {Laboratoire de Chimie et Physique Quantiques}
+\def\CityZip {Toulouse, France}
+\def\Email   {loos@irsamc.ups-tlse.fr}
+\def\TEL     {+33 5 61 55 73 39}
+\def\URL     {} % NOTE: use $\sim$ for tilde
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% MARGINS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\textwidth       6in
+\textheight      9.25in
+\oddsidemargin   0.25in
+\evensidemargin  0.25in
+\topmargin       -1.50in
+\longindentation 0.50\textwidth
+\parindent       5ex
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%% ADDRESS MACRO BELOW %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\address{
+    \includegraphics[height=0.7in]{CNRS_logo.pdf}     \hspace*{\fill}\includegraphics[height=0.7in]{UPS_logo.pdf}
+	\\
+	\hrulefill
+	\\
+	{\small \What~\Who\hspace*{\fill} Telephone:\ \TEL
+	\\
+	\Where\hspace*{\fill}  Email:\ \Email
+	\\
+	\Address\hspace*{\fill}
+	\\
+	\CityZip\hspace*{\fill} \URL}
+	 }
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%% OTHER MACROS BELOW %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%\signature{\What~\Who}
+
+\def\opening#1{\ifx\@empty\fromaddress
+ \thispagestyle{firstpage}
+ \hspace*{\longindendation}\today\par
+ \else \thispagestyle{empty}
+ {\centering\fromaddress \vspace{5\parskip} \\
+\today\hspace*{\fill}\par}
+ \fi
+ \vspace{3\parskip}
+ {\raggedright \toname \\ \toaddress \par}\vspace{3\parskip}
+ \noindent #1\par\raggedright\parindent 5ex\par
+ }
+
+%I do not know what does the macro below
+
+%\long\def\closing#1{\par\nobreak\vspace{\parskip}
+ %\stopbreaks
+ %\noindent
+ %\ifx\@empty\fromaddress\else
+ %\hspace*{\longindentation}\fi
+ %\parbox{\indentedwidth}{\raggedright
+ %\ignorespaces #1\vskip .65in
+ %\ifx\@empty\fromsig
+ %\else \fromsig \fi\strut}
+ %\vspace*{\fill}
+% \par}
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