1. Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife, KY16 8LB, United Kingdom
2. SMRU Consulting, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife, KY16 8LB, United Kingdom
3. TNO, Acoustics and Sonar expertise group, Oude Waalsdorperweg 63, 2597 AK, The Hague, Netherlands