The Δ[Fe/H]_lit = [Fe/H]- [Fe/H]_lit for each star and node for our GBS candidates and the current GBS stars ordered by metallicity. The node symbols are as follows: (1) iSpec is represented as a blue open hexagon; (2) BACCHUS/ULB is represented as a magenta open diamond; (3) EPINARBO is represented as a green open star; and (4) Bologna is represented as a red open triangle. We do not display the nodes that are used in Paper III and not this work. The typical dispersion between the methods is on the order of ±0.03 dex while the typical offset between the literature and the each method is on the order of +0.04 dex.