Observed (solid lines) and computed (dashed lines) isophotes of TNG image on 2003, March 27 at 2.58 AU post-perihelion. Left panel: seasonal ejection with the time-dependent size distribution shown in panel d of Fig. 3, with a power index ranging from −3.0 before perihelion to −4.2 after; isotropic ejection provided very similar fits (Fig. 4). Right panel: constant size distribution index at −3.6. The innermost isophote corresponds to Af = 10^-7, the outer isophotes decrease of a factor 2 in Af. The Sun direction is along the −y axis; the north direction is in PA = 133° clockwise from +y, scale in 10⁶ km.