HVC model with an initial gas mass of M_gas = 4.4 × 10⁵   M_⊙ (Setup 2-DD): color-coded pressure distribution (logarithmic scale [dyne cm^-2]) through the midplane (z = 0) of the 3D simulation box overlaid with Hi column density contours between log (N_HI) = 18.5...21.5   cm^-2 in steps of 0.5 dex, 100 Myr after the onset. Upper left panel: cloud without DM  (Run VI), upper right panel: cloud embedded in an NFW halo (see Sect. 4.3.3); lower panels: clouds with Burkert halos with r₀ = 150   pc (Run VII, left panel) and r₀ = 250   pc (Run IX, right panel), respectively. The red contour depicts the (E_kin + E_i) = −E_pot boundary and encloses all material, both from the cloud and from the hot halo gas, which is gravitationally bound to the HVC. The velocity vectors indicate a maximum velocity of 215  km s^-1 and their lengths are linearly scaled.