Left panel: CO 3–2 integrated intensity image where emission close to systemic velocity (0–70 km s⁻¹) is shown in greyscale (ranging from 0 to 1 Jy km s⁻¹). The high-velocity (±80 to ±160 km s⁻¹) emission from the molecular jet is shown in contours (with the red and blue showing the velocity reversals). The contour levels are 6 × 10⁻³ × (1, 2, 4, 8, 16, 32, 64) Jy km s⁻¹ beam⁻¹. Right: chart of the various components of the molecular structure of NGC 1377 as presented in Sect. 3.1. The outline of the slow wind (which may be a jet cocoon (Sect. 6.4)) is largely taken from the low-velocity gas in Aalto et al. (2016) since a significant fraction of he extended low-velocity gas is missing in the high-velocity data (Sect. 3.2).