Selection of formaldehyde (H₂CO, J_KK′:9₁₈–9₁₉, at 216568.651 MHz) channel maps (δV = 0.68 km s⁻¹). The top left corner indicates the channel velocity, the species, and its upper energy level. White contours are at 10 to 90% of the peak emission of the strongest channel for that species. Yellow arrows starting from the explosion center (red eight-pointed star) suggest possible displacement of gas linked to the explosive event, which occurred 550 ± 25 years ago. Five-pointed stars denote the position of the 10 sources studied in Paper I (Fig. 1, see also Fig. A.1 here). Underlying color map (enhanced by black contours) in this and subsequent figures is the 1.2 mm continuum emission (Paper I).