Square root of the second-order structure function (or angular dispersion function (ADF)), (degree), of the polarization angles versus distance (l) (pc) using 127 stars of L1570. The filled circles are the ADF values in each bin. The error bars are similar to the size of the symbols. The turbulent contribution to the total angular dispersion function is determined by the zero intercept of the fit to the data at l = 0. The measurement errors were removed before fitting the function to the data. The thick dotted line denotes the best fit to the data for a distance of less than 0.2 pc.