Fig. 2
Looptop (a), footpoint (b) sources and spatially integrated (c) HXR spectra (black) of flare A, 2002 July 23, estimated background (gray), and fitting result (red) and its components: thermal (green) and non-thermal (blue). For the looptop spectrum, the non-thermal is a thin-target model; for the footpoint and integrated spectra, it is a thick-target model.
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