Acoustic comparisons of calls by sound producer. RMS Received level (a) and Signal-to-noise ratio (b) of calls produced by the tagged whale vs the non-tagged whale (identified using the accelerometer method). Includes DTAG3 call data only. RLs reported here have not been adjusted to compensate for tag filtering and are therefore only valid in comparison to each other, within a given tag (though varying ambient noise due to swim speed fluctuations may still play a role), and not to RLs reported either from tags elsewhere or to source levels calculated from passive acoustic data. Box plot whiskers represent data within 1.5 interquartile range of the lower and upper quartiles, and red crosses represent outlier data points given this criterion.