Difference of the logarithmic Ne (top left), S (top right) and Ar (bottom panels) abundances calculated from the spectra of the DESIRED-E sample using various ICF schemes. In the bottom left panel we use ICF(Ar) using only [Ar III] lines and in the bottom right panel [Ar III] and [Ar IV] lines. The different symbols represent the pairs of ICF used in each case. The horizontal black line indicates equal abundance. Amayo+21: Amayo et al. (2021); Izotov+06: Izotov et al. (2006); Dors+13: Dors et al. (2013); Dors+16: Dors et al. (2016); and PM+07: Pérez-Montero et al. (2007).