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Fig. 1. Three suction cup hydrophone configurations used to measure the sound field
at the surface of the porpoise head. (A) The line configuration, (B) the T1
and (C) T2 configurations. The Label R in each panel denotes the reference
hydrophone, which was placed at the same position on the animal for all three
array configurations (see lower panels). Each hydrophone was also designated
by a number.