Resonance plays a secondary role in amplifying underwater vocalizations of Weddell seals (Leptonychotes weddellii).

The date are of the highest amplitudes across the frequency range of Weddell seal tonal trills (an underwater call made by males). Each column presents the results of a frequency amplitude measure that is relative to the highest amplitude of that trill, independent of the frequency at which that amplitude occurs. This removes the influence of the overall amplitude of the call which is influence of the distance the sea was from the hydrophone when the recording was made. Four trill patterns were identified (A - D) and a number of trills not included in the analyses are classed as type X. The X call types were excluded because the original recording was later found to be overloaded or partly masked by ice noises or the calls of another seal. Analysis details are included in the accompanying manuscript.

The accompanying Excel file contain the frequency amplitude measurements of individual trills at two location groups: the Aurora Truning location at the anchorage location of the Aurora Australis near Davis and the other group is a number of breeding groups in the Vestfold Hills.
Variable A is the frequency in Hz,
Variables B to DH at the Aurora Turning location and B to BY at the Davis locations are data from individual trills.
Rows 2 or 3 indicate the four Trill patterns, A, B, C or D, with an X designation for trills that were not included in the analyses due to limited frequency ranges or overloading of the original recordings (that was discovered later in the analyses).
ssize or samplesize is the number of trills that were at each frequency bin.

本数据集涵盖威德尔海豹（Weddell seal）音调性颤鸣（tonal trill，雄性个体发出的水下叫声）全频率区间内的最高振幅相关数据。每一列对应一项频率振幅测量结果，该结果以对应颤鸣的最高振幅为基准进行归一化，与振幅出现的具体频率无关。该处理消除了叫声总振幅的影响——而总振幅受录制时声源与水听器（hydrophone）的距离影响。研究共识别出4种颤鸣模式（A至D），另有部分未纳入分析的颤鸣被归类为X型。X型叫声被排除的原因是，后续分析发现其原始录音存在过载问题，或部分被冰噪声、其他海豹的叫声所遮蔽。详细分析细节见随附的研究手稿。

随附的Excel文件包含两类采样点下单只海豹颤鸣的频率振幅测量数据：一类是位于戴维斯（Davis）附近的南极光号（Aurora Australis）锚泊地的Aurora Turning采样点，另一类是维斯托尔德丘陵（Vestfold Hills）的多个繁殖种群采样点。变量A为频率，单位为赫兹（Hz）；Aurora Turning采样点的变量B至DH，以及戴维斯采样点的变量B至BY，均对应单只海豹的颤鸣数据。第2行或第3行标注了4种颤鸣模式（A、B、C、D），对于因频率范围受限或原始录音过载（后续分析中发现）而未纳入分析的颤鸣，则标注为X型。ssize（或samplesize）表示每个频率区间内的颤鸣数量。