Snapshots of gas density and stellar distribution at 4t_ff for different maximum grid resolutions. The ionization fronts are marked with cyan lines. Stars are shown as black dots; massive stars are highlighted in red, with sizes proportional to their masses. In each panel, the following notations are used: (bottom left) physical scale; (bottom right) the mass of the most massive star, total stellar mass, and number of stars; (top left) model label; (top right) simulation time. The color scale indicates the gas density in grams per cubic centimetre. The panel for model n3s3, marked with a ★ (simulation time), is shown 40 kyr earlier than 4t_ff, because a 60 M_⊙ star forms shortly afterward; at the displayed time, the feedback is dominated by an 18 M_⊙ star.