We gratefully thank Mathias Löwe for performing the near-infrared observations at the Calar Alto observatory and for his helpful support concerning the data reduction. We also gratefully acknowledge the efficient help by the IRAM, Calar Alto, and ESO support teams during the observations. Furthermore, we thank R. Zylka for providing the very powerful software packages for the reduction of the double-beam bolometer maps. R. Launhardt acknowledges support through the Verbundforschung Astronomie/Astrophysik grant No. 500R94149 and A. Burkert through the Max Planck Society.
© European Southern Observatory (ESO) 1998
Online publication: July 20, 1998