Panels A and B: spectral index α from the power law fittings (with ℛ2 > 0.95) as a function of radial distance from the comet for the singing dominated intervals and the no singing intervals. For a bin size of 100 km the median (red), mean (green), and standard deviation (blue) of the α-distribution are plotted. Panels C and D: spectral index α as a function of log(P0) from the power law fittings. For a bin size of 1 the median (red), mean (green), and standard deviation (blue) of the α-distribution are plotted.
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