Before revision:  For a certain class of IDPs, with N between 24 to 185 , the size grows as R_g \sim N^{0.6}, which agrees with data from Small Angle X-ray Scattering (SAXS) experiments . The theory also describes quantitatively the R_g measured using SAXS experiments for the wild type Tau proteins and fragments derived from it. In this case we find that R_g \sim N^{0.5.
After revision:  For a certain class of IDPs, with N between 24 to 185 , the size grows as R_g \sim N^{0.6}, which agrees with data from Small Angle X-ray Scattering (SAXS) experiments .