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Fig. 4. (A) Mean surface interval and (B) dive durations ± S.E.M. in control and pharmacologically blocked harbour seals (N=5). Note that the time scales for each graph are different. {alpha}, seals treated with {alpha}-adrenergic blocker; ß, seals treated with ß-adrenergic blocker; mu+{alpha}, seals treated with muscarinic and {alpha}-adrenergic blockers combined; mu+ß, seals treated with muscarinic and ß-adrenergic blockers combined.