"Efficiencies of $B^+ \to \pi^+ \mu^\pm e^\mp$ channel" of "Search for the lepton-flavour violating decays $B^+ \to π^+ μ^\pm e^\mp$"

Selection efficiency of $B^+ \to \pi^+ \mu^\pm e^\mp$ decays as function of the squared invariant masses, $m^2_{\pi^+ \mu^\pm}$ and $m^2_{\pi^+ e^\mp}$. The efficiency varies across the Dalitz plane due to the applied selection requirements.