\documentclass[a4paper,10pt]{letter}

% common stuff
\input{header}

% background picture
\renewcommand{\emblem}{%
  \put(55,  10){\includegraphics[width=40mm]{graphics/emblem_detector}}
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% % Basic variant
% % text for explanation
\renewcommand{\explaintext}{
You are a detector, an experiment patiently waiting for signals from outer space.
\textbf{First}, write your name on the front. Then check the info about yourself and start looking for \textbf{sources} whose messengers you can detect.
Count how many you have detected like so: \includegraphics[height=1em]{graphics/countingmarks}. 
And any time you're wondering what all these crazy words actually mean, just ask one of the \textbf{physicists}.
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% % Basic variant, French
% \renewcommand{\explaintext}{
% Vous êtes un détecteur, une expérience attendant patiemment un signal en provenance du cosmos.
% \textbf{D'abord}, écrivez votre nom à l'avant. Ensuite, lisez les informations vous concernant et commencez à chercher les \textbf{sources} produisant des messagers que vous êtes capable de détecter.
% Comptez le nombre d'observations que vous avez fait comme suit :\includegraphics[height=1em]{graphics/countingmarks}. 
% À chaque fois que vous vous demandez ce que ces termes un peu barbares signifient, n'hésitez pas à questionner un des \textbf{physiciens} présents.
% }

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% % Variant A
% % text for explanation
% \renewcommand{\explaintext}{
% You are a detector, an experiment patiently waiting for signals from outer space.
% \textbf{First}, write your name on the badge and put on on. Then check the info on this card and ask the \textbf{sources} if they have messengers you can detect. Only show your card when asked!
% Count how many you have detected underneath your name, like so: \includegraphics[height=1em]{graphics/countingmarks}. 
% And any time you're wondering what all these crazy words actually mean, just ask one of the \textbf{physicists}.
% }

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% % Variant B
% % % text for explanation
% \renewcommand{\explaintext}{
% You are a detector, an experiment patiently waiting for signals from outer space.
% \textbf{First}, write your name on the front. Then check the info about yourself and start looking for \textbf{sources} with a messenger you can detect. Then team up with another detector that can detect an additional type of messenger from that source, and both of you have made a multi-messenger detection. Count these like so: \includegraphics[height=1em]{graphics/countingmarks}. 
% And any time you're wondering what all these crazy words actually mean, just ask one of the \textbf{physicists}.
% }


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% the pins for the partipiciants ...
%% you can generate this part from a database!
\begin{document}
%      experiment			location				messengers
\badge{LIGO}	{Hanford \& Livingston, USA}	{gravitational waves}
\badge{VIRGO}	{Pisa, Italy}	{gravitational waves}
\badge{Fermi}	{satellite}	{gamma rays}
\badge{MAGIC}	{La Palma, Canary Islands}	{gamma rays, cosmic rays}
\badge{VERITAS}	{Mount Hopkins, USA}	{gamma rays, cosmic rays}
\badge{H.E.S.S.}	{Khomas Region, Namibia}	{gamma rays, cosmic rays}
\badge{HAWC}	{Sierra Negra volcano, Mexico}	{gamma rays, cosmic rays}
\badge{ANTARES}	{Mediterranean Sea}	{neutrinos, cosmic rays}
% \explanationpage
\badge{IceCube}	{glacier, South Pole}	{neutrinos, cosmic rays}
\badge{ARA}	{glacier, South Pole}	{neutrinos}
\badge{ANITA}	{balloon, Antarctica}	{neutrinos}
\badge{Pierre Auger Observatory}	{Mendoza Province, Argentina}	{cosmic rays, gamma-rays}
\badge{Telescope Array}	{Millard County, USA}	{cosmic rays}
\badge{IceTop}	{surface, South Pole}	{cosmic rays, gamma rays}
\badge{LOFAR}	{Netherlands}	{radio waves, cosmic rays}
\badge{Very Large Array}	{Socorro, USA}	{radio waves}
% \explanationpage
\badge{Swift-XRT}	{satellite}	{X-rays}
\badge{MASTER}	{worldwide network}	{visible light}
\badge{Hubble}	{satellite}	{visible light}
\badge{Super-Kamiokande}	{Mozumi Mine, Japan}	{neutrinos}
% doubled from here to fill 5 pages
% \badge{LIGO}	{Hanford \& Livingston, USA}	{gravitational waves}
% \badge{VIRGO}	{Pisa, Italy}	{gravitational waves}
% \badge{Fermi}	{satellite}	{gamma rays}
% \badge{MAGIC}	{La Palma, Canary Islands}	{gamma rays, cosmic rays}
% \badge{VERITAS}	{Mount Hopkins, USA}	{gamma rays, cosmic rays}
% \badge{H.E.S.S.}	{Khomas Region, Namibia}	{gamma rays, cosmic rays}
% \badge{HAWC}	{Sierra Negra volcano, Mexico}	{gamma rays, cosmic rays}
% \badge{ANTARES}	{Mediterranean Sea}	{neutrinos, cosmic rays}
% % \explanationpage
% \badge{IceCube}	{glacier, South Pole}	{neutrinos, cosmic rays}
% \badge{ARA}	{glacier, South Pole}	{neutrinos}
% \badge{ANITA}	{balloon, Antarctica}	{neutrinos}
% \badge{Pierre Auger Observatory}	{Mendoza Province, Argentina}	{cosmic rays, gamma-rays}
% \badge{Telescope Array}	{Millard County, USA}	{cosmic rays}
% \badge{IceTop}	{surface, South Pole}	{cosmic rays, gamma rays}
% \badge{LOFAR}	{Netherlands}	{radio waves, cosmic rays}
% \badge{Very Large Array}	{Socorro, USA}	{radio waves}
% % \explanationpage
% \badge{Swift-XRT}	{satellite}	{X-rays}
% \badge{MASTER}	{worldwide network}	{visible light}
% \badge{Hubble}	{satellite}	{visible light}
% \badge{Super-Kamiokande}	{Mozumi Mine, Japan}	{neutrinos}
% \explanationpage
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% % Variant A
% \emptypage
% \blankpage
% \emptypage
\end{document}