1. Center for Oceanographic Research COPAS Sur-Austral and COPAS COASTAL, Universidad de Concepción, Casilla 160-C, Concepción 4070043, Chile
2. Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo 1780000, Chile
3. Speech and Processing Transmission Laboratory, Electrical Engineering Department, University of Chile, Santiago 8330111, Chile
4. Departamento de Ingeniería Eléctrica, Universidad de Concepción, Concepción 4070043, Chile
5. Marine Mammal Institute, Oregon State University, Newport, OR 97365, USA