Existing models and data for Malin 1. In addition to the data presented in Fig. 3, the green dotted curve is a model from Lelli et al. (2010), assuming a constant stellar mass-to-light ratio (M_⋆/L = 3.4). The brown open circles with the shaded region correspond to an IllustrisTNG100 simulated data from Zhu et al. (2018) for a galaxy similar to Malin 1. The blue open circles indicate the data from Reshetnikov et al. (2010) using stellar absorption lines with the error bars denoted as the blue shaded region.