Stellar mass distribution of our z> 3 SMGs (green histogram), and z ~ 2 cQGs (2014; red histogram). The blue histogram shows the distribution of the final stellar masses of the z> 3 SMGs by assuming that 10% of their putative gas mass content is converted into stars by the end of the ongoing starburst event, while the magenta dashed histogram represents the final stellar mass distribution where M_gas is based on the mass-metallicity relationship (see text for details). The CO-based gas mass estimate was adopted for AzTEC 1 and AzTEC 3 (Appendix D).