Same as Fig. 2, but for a part of the light curve that takes place during the transition from the wind phase to the cooling phase (﹩t\sim 14{\mbox{--}} 22﹩ days). When the optically thick wind stops at ﹩t=17.5﹩ days, the photosphere of the WD envelope drastically shrinks from ~0.1 to ~0.003 R_⊙ within 1 day. This makes a drop of ﹩\Delta m_{V}\sim 0.3﹩ near ﹩t\sim 18﹩ days (HJD 2,451,253), which is followed by a further drop of ﹩\Delta m_{V}\sim 0.4﹩ caused by a reduction of the accretion disk (ACDK) size. The detection of an SSS by BeppoSAX is very consistent with the wind duration because supersoft X‐rays emerge only after the massive wind stops.