Log − Log plot of the NUV structure function as a function of rest frame time-lag for radio bright UVQs (R ^∗  > 1, filled circles) and radio quiet (R ^∗  < 1, open circles) UVQs, as detected by the VLA 20 cm FIRST survey. Best fit straight lines are shown for each of the two data sets. The radio bright NUV data are best fit with a line of slope 0.25 (intercept 0.05) and the radio faint sources with a similar slope of 0.24 (intercept 0.08).