Inset: temperature dependences of the resistivity ρ for B = 0.194 T (cut d in Figs 2 and 3, which crosses the A-phase) and B = 0.308 T (the cut, which is outside the A-phase area). The ρ(T) curve for B = 0.308 T is shifted downwards by 5 μOhm·cm for clarity. Main panel: temperature dependence of the difference ρ(0.194 T)-ρ(0.308 T). Dashed-dotted lines mark the transitions between the C phase, A-phase, A-phase core and paramagnetic phase (see also Fig. 2). Dashed lines are guides for the eye denoting the different trends of MR in the magnetic phases of MnSi. In all cases, the magnetic field is applied parallel to the  direction.