Top: in situ SFR around the epoch of the last major merger. The colored solid vertical lines indicate the snapshots studied in Section 3.2. These snapshots are sorted into three groups: pre-merger (orange); interaction, separation, and merger (blue); and post-merger (green). The thick lines indicate the first and second (last) pericenter passages. The dotted lines mark the two pericenter passages of the previous major merger. Bottom: radial distribution of the SFR, normalized to the total SFR at these epochs, and smoothed for the sake of readability.