Comparison of Balmer continuum spectra for the photoionization processes (a) 2p−1 → 0+ at γ = 0.05 au, (b) 2p0 → 0+ at γ = 0.01 au, and (c) 2p0 → 0+ at γ = 0.05 au. The cyan solid and magenta dashed curves represent the current results from the adiabatic-basis-expansion method, and those from the complex-rotation method (Zhao & Stancil 2007b). The ejected electron energies span the scope from the first to the third Landau thresholds, marked by the dashed–dotted vertical lines.