Dendrogram of the Leike et al. (2020) 3D dust map. Structures that survive the cloud filtering scheme summarized in Section 3.1.1 are color coded by their mean density (n _average in the context of Table 1), with filtered-out structures shown in black (totaling 3.7 × 10⁴ M _☉). A constant isosurface density of ﹩{n}_{\min }=25\,{\mathrm{cm}}^{-3}﹩ (dashed horizontal line) is used to define cloud boundaries and will preordain the narrow range of mean cloud volume densities (33 cm⁻³ ≤ n _average ≤ 92 cm⁻³) seen in our sample.