Distribution of log(gf) vs. Δ log(gf) (VALD3–BRASS) for the VALD3 (2016) and BRASS (2012) non-parametric cross-match. For clarity and consistency a small number of transitions with |Δlog(gf)| > 2 have been excluded. In some extreme cases these Δlog(gf) values can be as large as Δlog(gf) ± 4 dex. We see a secondary peak in Δlog(gf) values at Δlog(gf) = −0.1 dex. This is due to differences in Fe I lines from May et al. (1974) and Fuhr et al. (1988): both use the log (gf) values of Bridges & Kornblith (1974) however Fuhr et al. (1988) apply a systematic shift to the log (gf) values of −0.1 dex.
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