Baryonic matter density, as a function of height above the Galactic plane. Five coloured 1-σ bands show the total baryonic density, as well as a division into four separate groups: the “stars and dwarfs” include all types of stars, white dwarfs, and brown dwarfs; the “cold atomic gas” and “molecular gas” correspond directly to their respective single components of Table 2; the “warm and hot gas” correspond to the warm atomic gas and hot ionised gas components.