Snapshots showing the total gas column density (top row), the C II luminosity (middle row), and the FIR luminosity (bottom row) for four different snapshots taken at 70, 160, 170, and 280 Myr. Each side has a size of 2 kpc. The three most massive clusters are formed during the merging process, indicated in the t = 160 and 170 Myr panels, and create expanding H II regions. The merger becomes bright in [C II] emission for t ≳ 150 Myr when SFR ≳ 10⁻³ M _⊙ yr⁻¹ (see also Figure 2). Similarly, the FIR luminosity increases during the second merger and remains high thereafter.