D. Semenov
Astrophysical Institute and University Observatory,
Schillergäßchen 2-3, 07745 Jena, Germany,
Th. Henning
Max-Planck-Institute for Astronomy,
Königstuhl 17, 69117 Heidelberg, Germany
M. Ilgner
Institute of Astronomy and Astrophysics, Auf der Morgenstelle
10, 72076 Tübingen, Germany
Ch. Helling and E. Sedlmayr
Center for Astronomy and Astrophysics, TU Berlin,
Hardenbergstraße 36, 10623 Berlin, Germany