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Fig. 2.
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Hardness-intensity diagram of 4U 1543–47 during its 2021 outburst (from MAXI data). The VLT/X-shooter spectroscopic epochs 1 and 2 are marked with grey and green stars, respectively. The evolution of the 2018–2019 outburst of MAXI J1820+070 is over-plotted in red for the sake of comparison (see text).
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