1. Azti-Tecnalia, Txatxarramendi Ugartea z/g, E-48395 Sukarrieta, Bizkaia, Basque Country, Spain
2. Azti-Tecnalia, Herrera Kaia-Portu aldea z/g, E-20110 Pasaia, Gipuzkoa, Basque Country, Spain
3. Department of Computer Science and AI, Intelligent Systems Group (ISG), University of the Basque Country, Paseo Manuel de Lardizabal, 1. E-20018, Donostia-San Sebastian, Gipuzkoa, Basque Country, Spain
4. Institute of Marine Research, PO Box 1870, N-5817 Bergen, Norway
5. Department of Mathematics, University of Iceland, and Marine Research Institute, Skúlagata 4, PO Box 1390, 121 Reykjavik, Iceland