Dust attenuation versus stellar mass of the HIERO sample. The x-axis is on a logarithmic scale. The solid dark teal line reports the relation from McLure et al. (2018), while the purple line delimits the area that identifies the so-called Highly Extincted Low-Mass (HELM) galaxies (Bisigello et al. 2025). The median error for both quantities is reported in the top-left corner of the plot. Different symbols report values from previous studies, as indicated in the legend.