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Fig. 5


Top panels: time-distance maps for Encke and ISON in HI-1A and HI-2A with showing the manually determined data points tracking the oscillations. Middle and bottom panels: sequences of 10 consecutive frames for Encke and ISON with some sinusoids indicating propagating waves along the tail. Values of amplitude, wavelength, and phase of the oscillations are reported on each single frame. The time-steps in min from the first frame of the sequence are shown on the top horizontal axis for each frame.

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