1σ and 2σ confidence ellipses for the joint posterior distribution of the f_NL and b₀ parameters obtained from the C_ℓ^κG cross-correlation. The green contours assume the baseline σ₈ value preferred by the LRG sample used in this paper, while the grey, red, and blue contours assume other σ₈ determinations in the literature using Planck 2018, DESI 2024, and BOSS × Planck data, respectively.