Positron fraction as a function of the positron energy, for a DM mass m_χ = 600 GeV (left panel) and m_χ = 20 TeV (right panel), compared to AMS-02 data (Accardo et al. 2014). These values correspond to the cross section ⟨ σv ⟩ and branching ratios into lepton and pairs, which best fit the positron fraction, as from Figs. 4 and 5. Both values give excellent fits with of 0.5 (left) and 0.6 (right). The branching ratio into τ⁺τ⁻ amounts to 50% whereas the quark contribution increases from 20% (left) to 50% (right). The e⁺e⁻ and μ⁺μ⁻ channels disappear above 1 and 2 TeV, respectively. The cross section is equal to ⟨ σv ⟩ = 1.11 × 10^-23 cm³ s^-1 (left) and 1.09 × 10^-21 cm³ s^-1 (right). The contribution of each channel to the positron fraction is also indicated.