Fig. 2.

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Top panels: pulse profile of 2S 1845−024 in different energy bands obtained from the NuSTAR observation. Fluxes are normalized by the mean flux in each energy range. The red and blue dashed lines show the main maximum and minimum in the 3−7 keV band, respectively. The black dotted lines in the uppermost panel show the phase segments used to extract the phase-resolved spectra. Bottom panel: hardness ratio of the source over the pulse phase calculated as a ratio of normalized count rates in the pulse profiles in the energy bands 18−30 and 3−7 keV. The hardness ratio of unity is indicated by the horizontal blue solid line.
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