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Fig. 4.
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Evolution of the investigated fundamental quantities for GRO J1750-27 as observed by NICER in each ObsID (x-axis) of the outburst monitored in 2021. Top panel (a): flux in the 1 − 10 keV band. Middle panel (b): hardness ratio [4 − 10 keV/1 − 4 keV]. Bottom panel (c): pulsed fraction.
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