1. Department of Physics, University of Patras , 26500 Patra, Greece
2. Astrophysics Division, National Institute for Space Research (DAS/INPE) , Av. dos Astronautas, 1758 - Jardim da Granja, São José dos Campos, SP 12227-010, Brazil
3. Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile , Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
4. Millennium Institute of Astrophysics , Nuncio Monseñor Sotero Sanz 100, Of. 104, Providencia, Santiago, Chile
5. Centro de Astroingeniería, Pontificia Universidad Católica de Chile , Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
6. California Institute of Technology , 1200 East California, Boulevard, CA 91225, USA