Top left panel: scatter plot of frequency vs. relative speed for Encke in HI-1A (black dots), and ISON in HI-1A (red) and HI-2A (blue). The slope of the fitting line is related to the Strouhal number. Top right panel: extrapolation of the Strouhal number with respect to the coma size L. Middle panels: Strohual numbers of each data point vs. time (left panel), and vs. the oscillation amplitude (right panel). Bottom panels: S t vs. the frequency f (left panel), and vs. the relative speed V (right panel).
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