\documentclass[a4paper]{newletter}
%\usepackage{german}

\name{Tuorla Observatory,\\Dr.\ Leo Takalo}
\street{V\"{a}is\"{a}l\"{a}ntie 20}
\city{21500 Piikki\"o}
\email{takalo@utu.fi}
%\tel{Tel: (0551) 39-50\,50}

\place{Tuorla}
%\date{25. April 2000}

\begin{document}
\begin{letter}{Universit\"{a}t Dortmund\\Prof.\ Dr. Wolfgang Rhode\\Otto-Hahn-Stra\ss e 4\\44227 Dortmund\\Saksa}

\opening{Agreement}

Dear Prof.\ Dr.\ Dr.\ Rhode, dear Prof.\ Dr.\ Mannheim,

we plan to use the proposed air-Cherenkov telescope prototype system
DWARF on the MAGIC/ORM site on La Palma for the continuous monitoring
of strong blazars. Whenever possible, the monitoring effort at VHE
gamma rays will be complemented at optical and radio wavelengths using
the KVA optical telescope operated by the Tuorla group and the
Mets\"{a}hovi Radio Observatory. The ultimate goal of this program is
to obtain long-term lightcurves of strong blazars to determine their
flux variation power spectrum across a broad wavelength range.  Thereby
we expect to achieve a major progress in understanding the mechanism
behind the variable non-thermal emission. The data rights of the
different telescope facilities remain proprietary to the operating
responsibles, but we intend to publish the results of joint campaigns
together on the basis of a consensus decision.

\vspace{0.5cm}

\closing{Signature}

\end{letter}
\end{document}
