Fig. A.1
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Spearman correlation coefficient between SCa II and SHα06 (black circles), and between SCa II and SHαW (green triangles) against the effective temperature (top panel), metallicity (middle panel), and median log R′HK. Horizontal dotted lines mark the thresholds for strong correlations at ρ = 0.5 and −0.5. Filled markers are significant correlations with p-value ≤ 10−3.
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