Star formation rate (left) and T_dust (right) plotted as a function of the size of the radio-emitting region (FWHM of the deconvolved major axis in kpc) at ν_obs = 3 GHz derived by Miettinen et al. (2017b). The MS SMGs are highlighted by red markers. The left-pointing magenta triangles indicate the upper size limits, while the green filled circles represent the survival-analysis based mean values of the binned data (each bin contains 14 SMGs), with the error bars showing the standard errors of the mean values. In both panels, the horizontal blue dashed line marks the median value of the y-axis parameter for the 98 analysed SMGs (SFR = 423M_⊙ yr^-1 and T_dust = 38.9 K).