Table 1.

Detailing the structure of treatments in the ‘during’ phase, including the array volumes used in ramp-up. Volumes are total volumes and may be a single airgun or a number of airguns operated simultaneously. Mean (and range) of received airgun SELs at the focal whale groups used in the analysis and distance (proximity) from the source.

treatment	duration of stage (min)	gun volumes (in3)	received SEL dB re 1 µPa2.s (mean and range)	source distance (proximity) m (mean and range)
ramp-up (first during phase)	30 (4 × 5 min stages and 1 × 10 min full array stage)	ramp-up 40, 250, 500, 1440, full array 3130	131 (76–166)	6878 (636–14 240)
full array (second during phase)	30	3130	130 (75–157)	8281 (3488–15 810)
control first 30 min	30	not applicable	not applicable	6244 (922–15 640)
control second 30 min	30	not applicable	not applicable	7521 (1093–13 950)