Bulk–edge correspondences in a finite-length topological Rashba wire as well as wave function distributions of the edge states. The black dotted lines are the bulk states and red solid lines represent the edge states residing in the energy gap in panels (a) and (b). The wave function distribution along the wire is plotted in panel (c) and it comes from the points A, B, C, and D marked in panel (a). The states with the same energy in panel (b) are plotted in panels (d) and (e). The superlattice periodicity is N = 3 and the wire length is N_T = 300 in panel (a) and N_T = 301 in panel (b).