Top left: λ vs. Δ λ for VALD3 vs. BRASS. Top right: small-scale correlations of λ vs. Δ λ for VALD3 vs. BRASS. Bottom left: λ vs. Δ λ for SpectroWeb vs. BRASS, which are cross-matched using a λ tolerance of ±0.1 . Bottom right: λ vs. Δ λ for TIPTOP vs. BRASS.
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