Location of our group sources on the SFR versus M* plane, in comparison to other sources from the literature at redshifts 4 < z < 5. Left: comparison to other lensed galaxies. Right: comparison to galaxies in the field, particularly prominent Hα emitters (Caputi et al. 2017) and ALMA galaxies (Faisst et al. 2020). In both panels, we indicate the average position of the star formation main sequence at the same redshifts, as obtained by Speagle et al. (2014; dashed-line) and Santini et al. (2017; solid line; determined by the analysis of lensing fields). The dotted line shows the lower envelope for the starburst classification at z ∼ 4.3 (Caputi et al. 2017). In all cases, thick lines are used for the stellar mass ranges in which these relations are known to be valid, while thin lines indicate linear extrapolations at lower stellar masses. For clarity, the source labels have been removed in the right panel.