1. European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany
2. National Institute of Nuclear Physics, Section of Naples (INFN), Via Cinthia, 80126 Naples, Italy
3. INAF—Institute of Radio Astronomy, Via Gobetti 101, 40129 Bologna, Italy
4. Italian ALMA Regional Centre, Via Gobetti 101, 40129 Bologna, Italy
5. Max Planck Institute for Astrophysics, Karl-Schwarzschild-Straße 1, 85748 Garching, Germany
6. Department of Physics Ettore Pancini, Federico II University, Via Cinthia 26, 80126 Naples, Italy
7. Department for Computer Science, Technical University of Munich, Boltzmannstr. 3, 85748 Garching, Germany