Kurucz model atmosphere (Castelli & Kurucz 2004, black solid lines) and WMBASIC (Pauldrach et al. 2001, colored histograms) incident continua for 36,000 K, 42,000 K, and 46,000 K hot stars. The vertical dashed lines correspond to the ionization potentials of Kr ii and Se iii. The higher T _eff models appear to have significant numbers of ionizing photons in the spectral regions required to produce Kr iii and Se iv; see the text. All spectra are normalized to the same total number of ionizing photons (log(Q) cm ⁻² s ⁻¹ = 15). Both model sets show significant numbers of ionizing photons in the range required to produce Kr iii and Se iv for the hotter stars. The cooler stars show a precipitous drop in ionizing photons.