Angular major axis FWHM at 3 GHz plotted against the S/N of the 3 GHz detection. AzTEC/C61 and C77a, which have S/Ns of 2713 and 115, respectively, are omitted from the plot for legibility purposes. The horizontal dashed line marks the median major axis FWHM of . The upper size limits are indicated by red, downwards pointing triangles. The green filled circles represent the mean values of the binned data (each bin contains 16 SMGs, except the highest S/N bin, which contains 17 SMGs, and where C61 and C77a have not been taken into account), with the error bars showing the standard errors of the mean values.