Rest-frame SED for an example TNG100 galaxy at z = 2 (subhalo ID: 63990, M_⋆ ≈ 10^11.2 M_⊙, SFR ≈ 140 M_⊙yr⁻¹), recorded at a distance of 10 Mpc. The blue line indicates the dust-free SED, i.e., using BPASS for all stellar populations and neglecting the diffuse dust in the ISM. Using only the evolved stellar populations (with ages above 30 Myr) leads to the red SED. The addition of younger stellar populations with TODDLERS templates (which incorporate unresolved dust) gives rise to the orange spectrum. Adding diffuse dust to this orange SED then leads to the final dust-attenuated SED shown in black. The lower panel indicates the (arbitrarily normalized) transmission curves for the Johnson UVJ broadband filters.