Posterior distributions on Ω_m and σ₈ from the ΛCDM fit to eRASS1 data are shown in orange. Similarly, the Planck CMB 2020 best-fit contours and eRASS1 with Planck CMB are shown in blue and red (Planck Collaboration VI 2020). This figure provides a comparison of eRASS1 with other cosmology probes, e.g., the cosmic shear constraints from the joint analysis of DES and KiDS data (Dark Energy Survey and Kilo-Degree Survey Collaboration 2023), DES 3x2 clustering constraints (Dark Energy Survey Collaboration 2022), KiDS 3x2 constraints (Heymans et al. 2021), results from the combined ACT lensing and BAO (Qu et al. 2024), Planck lensing analyses (Planck Collaboration VIII 2020), and SDSS BAO RSD (Alam et al. 2021).