Constraints on the logarithmic density slope of the total mass and the luminous mass in the nonevolution picture. 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 a singular isothermal sphere.