Top: representative galaxies of different stellar masses: a giant elliptical (M⋆ ∼ 2.5 × 1011 M⊙), a Milky Way-like galaxy (M⋆ ∼ 2.5 × 1010 M⊙), a UDG and dwarf galaxy (M⋆ ∼ 108 M⊙). All galaxies are shown to the same physical scale and a similar depth in surface brightness. Bottom: stellar mass density profiles of the same galaxies. The coloured ticks in the upper x-axis mark the location of Re. Similar ticks in the lower x-axis mark the location of R1.
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