Positron stopping range for different elements as a function of kinetic energy. The solid black curve denoted “tot” shows the range weighted by the different zones in the core. The lower horizontal dashed line marks the column density of the Fe/He zone (assuming it to exist as a single clump), and the upper that of the full core for V_core = 1800   km   s^-1. The long-dashed curve shows the cumulative positron distribution.