Stellar mass as a function of SFR (big panel) for the GMASS sample analyzed in this paper (black dots). Stellar masses have been computed by means of SED fitting (using Maraston 2005 models with a Kroupa IMF). The extinction-corrected SFR [M_⊙ yr^-1] was derived from UV luminosity measured from spectra. The black line is a linear fit to the GMASS data (in logarithmic scale). We also indicate the Pearson correlation coefficient r_xy. The open red triangles represent the sample of z ~ 2 SFGs from Daddi et al. (2007) (SFRs and masses scaled for a Kroupa IMF). In the smaller panel, stellar mass as a function of specific SFR is shown.