Surface densities within 2Reff as a function of galaxy stellar mass at different redshifts for stars (top), HI+H2 gas (n > 0.1 cm−3 and T < 2 × 104 K, middle), and H2 molecular gas (n > 10 cm−3 and T < 2 × 104 K, bottom). The solid lines represent the mean values, and the dashed lines stand for the error on the mean. Galaxies are denser at high redshift at fixed stellar mass and denser in more massive galaxies at fixed redshift.
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