Fig. 5
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Distribution of bandpasses that maximise the correlation between Hα and Ca II. The black histogram shows the bandpass distribution for stars with a weak or no correlation coefficient (−0.5 < ρ < 0.5), the blue hatched histogram shows stars with strong positive correlations (ρ ≥ 0.5), and the red histogram shows stars with strong negative correlations (ρ ≤ −0.5).
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