Lee,
S.-S.
Max Planck Institute for Radio Astronomy, Max Planck Society;
Lobanov,
A.P.
Max Planck Institute for Radio Astronomy, Max Planck Society;
Krichbaum,
T.P.
Max Planck Institute for Radio Astronomy, Max Planck Society;
Zensus,
J.
Max Planck Institute for Radio Astronomy, Max Planck Society;
