Fig. 5.
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Long-term correlation of the V-filter brightness and B − V colour index. The archival data is from the paper by Nieuwenhuijzen et al. (2012) and cover the period 1976–1993. The blue-green colour gradient indicates the date of measurements: the oldest points from 1976 are dark blue and the latest points are light green. We have added the data from BSM to show the continuing trend.
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