Mean 12 + log(O/H) profiles for levels of Σ(Hα) for UM 462 (upper panels) and IIZw40 (lower panels). The standard deviation for the different 12 + log(O/H) values within each bin are indicated by the shaded regions. A clear increase in the mean metallicity values can be observed with decreasing Σ(Hα) when using both the N2 and O3N2 indices across all calibrators. A slight upwards trend in 12 + log(O/H) is also observed with the direct method in the HII-dominated regions. However, this difference is not statistically significant within the uncertainties.