No adjustment to Hargreaves et al. (2010) FeH gf-values is needed: binary, cluster, and interferometric M-dwarf benchmarks give consistent Fe I/FeH metallicities and Teff within uncertainties.
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A Test of FeH Line Parameters using DR19 APOGEE spectra of Benchmark M Dwarfs
No adjustment to Hargreaves et al. (2010) FeH gf-values is needed: binary, cluster, and interferometric M-dwarf benchmarks give consistent Fe I/FeH metallicities and Teff within uncertainties.