  Recently, we have demonstrated (Jin et al. 2020, J. Phys. B: At. Mol. Opt.
Phys. 53, 075201) that a hybrid subconfiguration-average and level-to-level
distorted wave treatment of electron-impact single ionisation (EISI) of
W$^{14+}$ ions represents an accurate and manageable approach for the
calculation of EISI cross sections of a complex ion. Here we demonstrate the
more general validity of this approach by comparing hybrid cross sections for
EISI of W$^{15+}$ and W$^{16+}$ with the recent experimental results of Schury
et al. 2020, J. Phys. B: At. Mol. Opt. Phys. 53, 015201). Our calculations also
account for the resonant-excitation double autoionisation (REDA) process which
is important in the electron energy range 370-600 eV and for the possible
presence of initially metastable ions in the experiment.
