Comparison between SPIDER (grey region), ATLAS^3D (red region), MaNGA DynPop (orange region) and the theoretical M_tot–M_* relation from Moster et al. (2013) (pink region) with IllustrisTNG simulations having differing astrophysical feedback parameters. Each row in the plot corresponds to a different scaling relation, from top to bottom: stellar half-mass radius, R_*, 1/2, DM fraction within R_*, 1/2, f_DM(<  R_*, 1/2), DM mass within R_*, 1/2, M_DM, 1/2, and total (virial) mass, M_tot, as a function of stellar mass, M_*. Each column shows the effect of varying one of the four astrophysical parameters. The continuous coloured lines associated to the coloured regions represent the 16th, 50th (median) and 84th percentile of the respective observational dataset distributions. The scatter of the Moster et al. (2013) theoretical relation is taken to be the mean of the scatter of the M_tot-M_* relation from Posti et al. (2019).