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+\documentclass[10pt]{letter}
+\usepackage{UPS_letterhead,xcolor,mhchem,mathpazo,ragged2e,}
+\newcommand{\alert}[1]{\textcolor{red}{#1}}
+\definecolor{darkgreen}{HTML}{009900}
+\usepackage[
+	colorlinks=true,
+    citecolor=blue,
+    breaklinks=true
+	]{hyperref}
+\urlstyle{same}
+
+\begin{document}
+
+\begin{letter}%
+{To the Editors of the Journal of Chemical Physics}
+
+\opening{Dear Editors,}
+
+\justifying
+Please find enclosed our manuscript entitled \textit{``Connections between many-body perturbation and coupled-cluster theories''}, which we would like you to consider as a Communication in the \textit{Journal of Chemical Physics}.
+This contribution has never been submitted in total nor in parts to any other journal, and has been seen and approved by all authors.
+
+In the present contribution, following the works of Scuseria \textit{et al.} [\href{http://dx.doi.org/10.1063/1.3043729}{J.~Chem.~Phys.~\textbf{129}, 231101 (2008)}] and Berkelbach [\href{https://doi.org/10.1063/1.5032314}{J.~Chem.~Phys.~\textbf{149}, 041103 (2018)}], we prove exact equivalences between the Bethe-Salpeter equation (BSE) formalism combined with the $GW$ approximation from many-body perturbation theory and coupled-cluster (CC) theory at the ground- and excited-state levels.
+More specifically, we show how to recast $GW$ and BSE as non-linear CC-like equations that can be solved with the usual CC machinery with the same computational cost.
+The present work provides a clear path for the computation of ground- and excited-state properties (such as nuclear gradients) within the BSE@$GW$ framework that has been shown to be highly successful to compute low-lying excited states in molecular systems with a very attractive accuracy/cost ratio. 
+It also broaden the applicability of Green's function methods in the electronic structure community and beyond.
+
+Because of the novelty of this work and its potential impact in quantum chemistry and condensed matter physics, we expect it to be of interest to a wide audience within the chemistry and physics communities.
+We suggest Timothy Berkelbach, Gustavo Scuseria, George Booth, Stefano Evangelista, Xavier Blase, and Weitao Yang as potential referees.
+We look forward to hearing from you soon.
+
+\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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--- /dev/null
+++ 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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