  A huge difference in the harmonic yield from the two topological phases of
finite, dimerizing linear chains in laser fields has recently been observed in
all-electron time-dependent density functional simulations [D. Bauer, K.K.
Hansen, Phys. Rev. Lett. 120, 177401 (2018)]. In this work, we explore the
robustness of the effect concerning the size of the chains, a continuous
transition between the two topological phases, and disorder. A high robustness
of both the degeneracy of the edge states in the topologically non-trivial
phase and of the pronounced destructive interference causing a dip in the
harmonic spectra in the topologically trivial phase is observed.
