Fig. 3.
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De-reddened color evolution of T CrB from early 2005 to early 2025 based on AAVSO photometry. Top: (B − V)0 (red). Bottom: (U − B)0 (blue). Colors were computed from near-simultaneous (±0.25 d) AAVSO UBV measurements, adopting E(B − V) = 0.07 (Nikolov 2022). For clarity, the de-reddened color indices were averaged in 1-day bins.
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