Supplement to: Rollion-Bard, C; Saulnier, S; Vigier, N; Schumacher, A; Chaussidon, Marc; Lécuyer, Christophe (2016): Variability in magnesium, carbon and oxygen isotope compositions of brachiopod shells: Implications for paleoceanographic studies. Chemical Geology, 423, 49-60, https://doi.org/10.1016/j.chemgeo.2016.01.007