Star-formation rate–stellar mass diagram for the sample of 330 C III] + He II emitters selected for our analysis. The main sequence relation by Speagle et al. (2014) is drawn with a black continuous line, while the dashed parallel lines represent the 1σ dispersion and the dotted line the starburst limit (4× above the main sequence). Our best-fit M_⋆–SFR relation is represented with large red stars. On the y axis, we consider the SFR normalised to z = 3 assuming the evolving trend with redshift as (1 + z)^2.8 from Sargent et al. (2012).