Fig. 2.
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Hardness intensity diagram of GX 339−4 during the 2021 outburst. The Y-axis represents the count rate of LE from 2 − 8 keV. The hardness ratio (X-axis) is defined as the count ratio between the energy bands 2 − 4 keV and 4 − 8 keV. Each point represents one day. The red stars represent the days in the HIMS and the blue triangles represent those in the SIMS.
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