Particle fractions and chemical potential in the muon flavour sector computed by post-processing the simulation (BLh, 1.00) at 4.6 ms after merger. In the upper panels, we show the fraction of μ⁻ (left), the fraction of μ⁺ (centre), and the difference between the muon fraction and the one inherited from the cold NSs, that is, (right). In the lower panels, we show the fraction of ν_μ (left), the fraction of (centre), and the muon chemical potential (rest mass subtracted) (right). As in Fig. 1, the black lines mark isodensity contours.