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+\documentclass{letter}
+
+\usepackage{hyperref}
+\usepackage{fontspec}
+
+\usepackage{tikz}
+\usetikzlibrary{calc}
+
+
+% -----------------------------------------------------------------------------
+% Euroscipy information
+% -----------------------------------------------------------------------------
+\definecolor{EuroScipyBlack}{rgb}{0.0,0.0,0.0}
+\definecolor{EuroScipyBlue}{rgb}{0,0.36328125, 0.71875}
+\definecolor{EuroScipyGrey}{rgb}{0.65,0.65,0.65}
+\newcommand{\EuroScipyYear}{2014}
+\newcommand{\EuroScipyDate}{August 27-31, 2014}
+\newcommand{\EuroScipyPlace}{Cambridge, UK}
+\signature{The EuroScipy 2014 Organising Committee}
+\address{Cambridge,}
+
+
+\begin{document}
+
+\begin{letter}{ Object: Official invitation to <who>}
+
+% -----------------------------------------------------------------------------
+% Watermark
+% -----------------------------------------------------------------------------
+\begin{tikzpicture}[remember picture, overlay]
+  \node [anchor=south east, xshift=2cm,yshift=-2cm] at (current page.south east)
+      {\includegraphics[width=16cm]{logo}};
+  \fill [white,opacity=0.90] (current page.south west) rectangle (\paperwidth,\paperheight);
+  \node [anchor=north west,xshift=-.5cm,yshift=+.5cm] at (current page.north west)
+        {\includegraphics[width=1.1\paperwidth]{header.pdf}};
+  \fill [EuroScipyBlue,opacity=1.00] (current page.south west) rectangle ($(current page.south east)+(0cm,1cm)$);
+\end{tikzpicture}
+
+% -----------------------------------------------------------------------------
+% Header/logo
+% -----------------------------------------------------------------------------
+\begin{tikzpicture}[remember picture, overlay]
+  \begin{scope}[yshift=5.75cm]
+  \node at (0,0) [anchor=east] (logo) {\includegraphics[width=3cm]{logo}};
+  \node at (0,0) [anchor=west, inner sep=4pt, color=white,
+    fill = EuroScipyBlue] (website)
+        { \fontspec[]{TeX Gyre Heros}{WWW.EUROSCIPY.ORG}};
+  \node at (-4pt,3mm) [anchor=south west] (title)
+         { \fontsize{28}{28}\fontspec{TeX Gyre Heros}{EUROSCIPY}
+           \fontspec{TeX Gyre Heros}{\EuroScipyYear}};
+   \node at (-4pt,-3mm) [anchor=north west, color=EuroScipyBlue!50!white] (date)
+         {\fontspec{TeX Gyre Heros}{\EuroScipyDate}};
+   \node at (-4pt,-7mm) [anchor=north west, color=EuroScipyBlue!50!white] (place)
+         {\fontspec{TeX Gyre Heros}{\EuroScipyPlace}};
+  \end{scope}
+\end{tikzpicture}
+
+\opening{To whom it may concern,}
+
+I am writing to you on behalf of EuroScipy Organization (www.euroscipy.org/).
+We are hereby inviting you <name> to attend the conference, which will be held
+from 27th to 30th August 2014. We are confident that as a practitioner of
+scientific python, you will find the talks appealing and we are looking forward
+to your contribution toward the conference's success.
+
+We will also make sure to find an accommodation in Cambridge, UK for the period
+of your stay,
+
+\closing{Best Regards,}
+
+\end{letter}
+
+\end{document}
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