Optical and molecular views of NGC 5506. Top: HST/F606W image of NGC 5506 from Malkan et al. (1998). The black rectangle identifies a region of 15.3″ × 5.1″ (corresponding to 1.9 × 0.6 kpc²). Bottom: ALMA CO(3 − 2) intensity, velocity and velocity dispersion maps, clipped at a signal-to-noise ratio of 3. The contours are between 10⁻³ and 10⁻¹ Jy km s⁻¹ (with 0.5 dex steps) for the intensity map, between 1700 and 2000 km s⁻¹ (with 75 km s⁻¹ steps) for the velocity map, and between 10 and 90 km s⁻¹ (with 20 km s⁻¹ steps) for the velocity dispersion map. North is up and east is left, and offsets in the ALMA maps are measured relative to the 870 μm continuum peak (as in García-Burillo et al. 2021), marked with a star symbol in every panel. The ALMA beam (0.21″ × 0.13″) appears in every bottom panel as a black ellipse in the lower left.