The corona – chromosphere connection studied with simultaneous eROSITA and TIGRE observations

The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG mission

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Fig. 3

values computed using the relation given by Noyes et al. (1984) compared to the relation given by Mittag et al. (2013). The red dots mark the stars with B–V > 0.9. This extends the relation given by Noyes et al. (1984) beyond its definition region.

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