ICATE, CONICET, San Juan, Argentina
Instituto de Física, UFRGS, Porto Alegre, Brazil
Gemini Observatory, La Serena, Chile
Copyright © 2016 Rubén J. Díaz, Horacio Dottori et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.