Box size and resolution tests at redshift z ∼ 4–7. Top foue panels: SFR–M_FoF relation. Bottom four panels: SFR–M_⋆ relation. In all the panels, we compare (a) the Chabrier IMF, Early AGN, Strong winds configuration for two different box sizes: L = 24 Mpc h⁻¹ (Ch24_eA_sW – red triple dot–dashed line) and L = 12 Mpc h⁻¹ (Ch12_eA_sW - black dotted line) and (b) the Chabrier IMF, Late AGN, Weak Winds configuration for L = 24 Mpc h⁻¹ (Ch24_lA_wW – orange triple dot–dashed line) and L = 18 Mpc h⁻¹ (Ch18_lA_wW – blue dot–dashed line). In the top four panels, the blue dot–dashed horizontal lines represent the observational limits in the range of SFR of Smit et al. (2012) and the orange dot–dashed vertical line is our mass confidence limit (see Section 3.1). In the bottom 4 panels, we overplot the observed galaxy SFR(M_⋆) relations from Drory & Alvarez (2008, observed frame I-band selected sample – green dashed + dotted lines), Bouwens et al. (2012, droup-outs selection – blue triple dot–dashed lines + light blue shaded regions) and de Barros et al. (2014, droup-outs selection – nebular emission – red filled circles).