1. Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Morelia 58190, Mexico
2. Instituto de Astronomía, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
3. Aix Marseille Univ, CNRS, CNES, LAM, 13284 Marseille Cedex 07, France
4. Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu, CNRS, Université Paris Diderot, CEA-Saclay, F-91191 Gif-sur-Yvette, France
5. University of Crete, Department of Physics, GR-71003 Heraklion, Greece
6. IESL/Foundation for Research and Technology-Hellas, GR-71110 Heraklion, Greece
7. National Observatory of Athens, IAASARS, I. Metaxa and V. Pavlou, GR-15236 Penteli, Greece
8. Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada
9. Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, 8370190 Santiago, Chile