Posterior distributions of the spherical power-law density model parameters with linear redshift evolution. The blue contours indicate the posterior distribution adopting the triangular prior of β defined in Sect. 4.3.1. The yellow and red contours indicate the posterior distribution adopting the Gaussian priors of β based on Guerrini & Mörtsell (2024) and Bolton et al. (2006), respectively. The dashed black line corresponds to the singular isothermal sphere.