Surface density profiles of gas (black), H₂ (blue), CO (magenta), C⁺ (red), stars (orange), and young stars (teal, with ages less than 10 Myr) within the HYACINTH-post-processed galaxy. For each component, the profiles are normalised by their central value σ₀. For each radial bin, we calculate the surface density from the face-on projection from a cylinder with height of ±5 kpc. Among all components, C⁺ and young stars show the slowest decline as we move away from the centre of the galaxy, while H₂ and CO are more concentrated (see also Fig. 5). The dashed grey line denotes the size of the galaxy as defined in T15.