Comparison of the derived extinction-corrected SFRs and stellar mass of the 8 o’clock arc (large black circles, showing the results with/without nebular emission and with SFR_Hα/SFR_SED) with those from other samples of LBGs at z ~ 2−3. The black triangles and small circles show the z ~ 2 objects from Erb et al. (2006b,c) with dust-corrected SFRs determined from Hα and from SED fitting, respectively. The red circles show the objects from Yoshikawa et al. (2010) with SFR_Hα corrected for dust extinction by assuming a different nebular and stellar attenuation. The yellow crosses are the z ~ 3 IRAC detected LBGs from Magdis et al. (2010). The green and blue crosses correspond to the U-dropout (z ~ 3) sample from the GOODS South field, analyzed by de Barros et al. (in prep.), with different assumptions in the SED fits (green crosses: constant SFR only, no nebular emission; blue crosses: variable star-formation histories, including nebular emission). All results were rescaled to the Chabrier (2003) IMF, if necessary. The dotted and dashed lines show the mass-SFR relations suggested by Sawicki et al. (2007) and Daddi et al. (2007) for z ~ 2 galaxies. The thin solid lines show the locii of constant specific star-formation rates, SSFR = 100, 10, and 1 Gyr^-1, respectively.