The total conductance G_L (solid curves) and the corresponding AR conductance G_A (dotted curves) in lead L through the double QDP chain versus the bias voltage eV between leads L and R when the MBS is coupled to QDP 1 (a) and QDP 2 (b). From bottom to top the curves are shifted up by 0.5e²/h in turn for clarity. The other parameters are taken to be Γ^L,R = 0.5, t₁ = 1, v_1,2 = 1, and εM = 0.