As Fig. 7, but instead of a single 40 000 K dwarf star, two 35 000 K dwarf model stars and three 30 000 K dwarf model stars (1.0 Z_⊙) are located in the center of the simulated volume. The total H-ionizing flux is 89% of the flux of the 40 000 K star with solar metallicity, resulting in a similar ionized volume, but because of the softer ionizing spectrum the fraction of singly ionized oxygen is larger than in the simulation with the 40 000 K star.