Fig. 2. Swimming jet (SJ) amplitude distribution and frequency. (A) Pressure amplitude (MMPA) distribution of spontaneously occurring high-pressure mantle cavity oscillations (SJs) of >0.2 kPa under control conditions (15°C). Amplitudes grouped into 1 kPa classes, frequencies expressed as percentage of total SJ frequency. The insert gives cumulative frequencies within selected intervals. (B) Frequency of SJs >0.2 kPa at all experimental temperatures, expressed in incidences per hour. N=5 animals per temperature. Error bars represent standard deviation. (C) SJ contribution to total mantle pressure generation in % of total mean mantle pressure (MMP_tot) at all experimental temperatures. See text for calculations.