Fig. 1.
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Two-colour diagram (U − B)0 versus (B − V)0. The left panel shows the dereddened colours of T CrB. The right panel shows the hot component (red giant subtracted). The green colours denote observations obtained during the superactive state (2016–2022), and the red colours relate to observations made shortly afterwards (April–October 2023). More details can be found in Table 1.
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