ZTF SN Ia DR2 Hubble diagram. Top: Hubble diagram of the 2629 standardized non-peculiar SNe Ia compared to the ΛCDM model anchored on (Planck Collaboration VI 2020) with an arbitrary zero-point offset. Bottom: Standardized Hubble residuals. Orange markers (lines) show the median (±nmad) data per bin of redshifts (Δz = 0.01). The light gray band shows the expected scatter caused by peculiar velocities of 300 km s⁻¹, while gray lines present the expected total scatter, adding in quadrature a 0.145 mag scatter (see text). Inset panel: Standardized Hubble residual distribution (blue) with a normal distribution centered on zero with a scatter of 0.145 mag, adding in quadrature a velocity dispersion (0.149 mag).