Left panel shows a comparison of mass function models available in the colossus Python package relative to the Tinker08 model, in the cosmology of the mock observation; i.e., Ω_m = 0.3089, σ₈ = 0.8159, and H₀ = 67.74, and for z = 0.426, which is the median redshift of the mock observation. The bottom plot shows the residuals. The right panel shows the crossed posterior distributions of Ω_m and σ₈ for a mock survey covering 50 deg² with a nonuniform proposal. Different colors represent different runs, each using a distinct mass function model available in the colossus Python package. The Planck value of Ω_m and σ₈, which corresponds to the true values implemented in the mock, is also shown for reference. The contours represent the 1σ and 2σ confidence levels.