Relevant parameters of the ETHOS (Effective Theory of Structure Formation) models considered in this work. Here, α_χ is the coupling between the mediator and dark matter, α_ν is the coupling between the mediator and a massless neutrinos-like fermion, m_ϕ is the mass of the mediator, and m_χ is the mass of the DM particle. The parameter a₄ is the coefficient of the power-law expansion in redshift of the DM drag opacity caused by the DM–DR interaction, which determines the linear initial matter power spectrum (see Cyr-Racine et al. 2016a). The parameters 〈σ〉₃₀, 〈σ〉₂₀₀, and 〈σ〉₁₀₀₀ are the DM self-interaction cross-sections at different velocities: 30, 200, and 1000 km s⁻¹ and describe the velocity-dependent cross sections. We refer the reader to Vogelsberger et al. (2016) for more details on these models.