Relation between the stellar mass and the extrapolated dark matter halo mass. We show the median and the 1σ scatter (16th to 84th percentile) for ALFALFA sample galaxies (blue solid), TNG100-mock (red solid), and TNG100-true (orange dashed and shadow). The estimated dark matter halo mass M₂₀₀ is derived from the dark matter mass within R_HI, using an NFW profile and the halo mass-concentration relation from Dutton & Macciò (2014). Late-type galaxies from Posti et al. (2019) and Di Teodoro et al. (2023) are shown with purple and green triangles, respectively. The SHMRs for early-type (pink dashed and shadow) and late-type (light blue dashed and shadow) galaxies from Mandelbaum et al. (2016) are also displayed.