Schematic picture of tracer particle motion. On the meridian plane, the tracer particle that is initially located outside the core (lower right) is ejected along the rotation axis (upper left) via the convective motion inside the neutrino-sphere (lower left). During the motion, the particle reaches the edge of the neutrino-sphere (﹩t={t}_{\nu }﹩) and escapes from the high temperature NSE region (﹩t={t}_{\mathrm{nse}}﹩).