Marginalized posteriors of ρ_DM(z) for mock data sets thick_bdd_1E6_0-19 with ρ_{DM, const} plus a ‘big’ DD component, reconstructed using a model with ρ_{DM, const} and a DD component. Dark, medium, and light shading indicate the 68 per cent, 95 per cent, and 99.7 per cent CRs, respectively. The median value of the posterior is shown as the solid blue line, while the DM density profile used to generate the mock data is shown as a solid black line.