Standard model (assuming on-the-spot positron absorption) (upper, black) compared to a model assuming positron deposition in proportion to the electron content of each core zone (lower, black). The latter uses a 40% smaller ⁴⁴Ti mass (in order to produce the correct total flux in the 2000–8000 Å range). The Mg I 2852 Å line continues up to  ~3.1 × 10^-15 in the bottom panel. The observed spectrum in red, same as in Fig. 3.