Schematic of \ahe\ production and propagation in our Galaxy. Distribution of DM density $\rho_{\rm DM}$ in our Galaxy as a function of the distance from the galactic centre according to the Navarro–Frenk–White profile~ (top). Graphical illustration of the \ahe\ production from cosmic-ray interactions with interstellar gas or DM ($\chi$) annihilations (bottom). The yellow halo represents the heliosphere and the Earth, Sun and positions of the Voyager 1, AMS-02 and GAPS experiments are depicted, too.