Abundance differences between the two ionisation stages for iron, Fe I – Fe II = log ε_FeI – log ε_FeII, for the seven Sculptor dSph stars of Tafelmeyer et al. (2010) and Jablonka et al. (2015), for the LTE and NLTE line-formation scenarios. The open squares correspond to LTE and the filled rhombi, squares, and circles to NLTE from calculations with S_H = 0.1, 0.5, and 1, respectively. The error bars correspond to σ_{FeI − FeII} for NLTE(S_H = 0.5).