Fig. 4
Comparison of X-ray spectra from comet Ikeya-Zhang (Ewing et al. 2013) and Jupiter (Branduardi-Raymont et al. 2007), observed during solar X-ray flares. The data sets have been scaled to overlay each other in order to better visualize the strong similarity in spectral structure between the two astronomical objects at energies above 1 keV.
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