Mattern,
M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;
Kainulainen,
J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;
Zhang,
M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;
Beuther,
H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;