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Fig. 1.

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Swift/BAT (15–50 keV) daily average light curve of GRO J1750-27 during the outburst in 2021 (black dots with gray error bars). Start times of each pointed observation are marked by vertical colored lines as detailed in the legend. NICER ObsIDs showing evidence of a secondary peak in the pulse profile (see text) are marked with a longer line.

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