Posterior contours of the assembly bias and environmental parameters in our baseline configuration (see Sect. 4.1). For the LRG, the negative value of B_cent, detected at 3σ, indicates that LRG centrals most likely occupy a dense environment. A negative value of A_sat at the 1σ level indicates that satellite galaxies could be preferentially located in more concentrated halos than average. For the ELGs, all parameters are consistent with zero at the 1σ level, suggesting that ELGs do not exhibit significant assembly bias or environmental dependencies.