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Fig. 3.

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Folded X-ray light curves as obtained for the epoch 16 March 2019 of the NuSTAR observation of IGR1654 in the 3–6 keV, 6–10 keV, and 10–30 keV energy bands. Bottom panels: hardness ratio curves HR1 and HR2, where HR1 is the ratio of the count rate in 6–10 keV to the count rate in the 3–6 keV energy bands, i.e., HR1 = (6–10)/(3–6), and HR2 is the ratio of the count rate in 10–30 keV to the count rate in 6–10 keV energy bands, i.e., HR2 = (10–30)/(6–10).

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