Dust attenuation as a function of stellar mass for our final 3 < z < 4 sample. BlueSFGs, RedSFGs and QGs are represented with blue dots, red diamonds and yellow dots with black circle, respectively. Their regression lines and ∼95% uncertainties are shown with a solid, dashed and doted line with a shaded area. We indicate the 99% mass-completeness limit of the sample with a thick black line.