Face-on and edge-on projections of stars (top panels) and gas (bottom panels) in four TNG50 central galaxies with varying stellar mass and rotational support. From left to right, galaxies increase in total stellar mass M_*, total gas mass M_gas, and rotational support κ_rot (values are shown in white labels). Cyan circles indicate our definition of galaxy size r_glx = 0.15 r₂₀₀; orange circles mark r = 1 kpc. Extended gaseous and stellar discs are more clearly evident in the two most massive galaxies (C and D). All galaxies exhibit a dense baryonic clump (gas and stars) in the central regions of r ∼ 1 kpc. The TNG50 Subhalo_IDs for these galaxies are: 830875 (A), 792447 (B), 733632 (C), and 643257 (D). Brighter colours indicate a higher number density of particles. Images were generated with PySPHViewer (Benítez-Llambay 2017).