Time evolution of the various ratios of BW, CD, and RS radii. The temporal evolution of the CD (blue) and RS (orange) radii normalised by the BW radius is displayed for 500 yr both for the simulation without (left) and with (right) turbulence. The plain curve corresponds to the average over all solid angles of the distribution of the ratio of the radii, and the coloured zones to their standard deviation. The hatched areas correspond to the radius ratios as observed in Warren et al. (2005).