Projected velocity-space distribution of Setup 3 without a DM halo at a maximum refinement level of 7. Top left panel: contour lines of the column density distribution (in z direction) at log (N_HI) = 18.8   ...   21.2   Hcm^-2 steps of 0.6 dex 100 Myr after the simulation onset. Both the x- and the y-coordinates correspond to the Cartesian grid of the 3D data cube. Radial velocities measurable along the line-of-sight (dashed line) in different directions of angle α = 0   deg,15   deg, and 30   deg with respect to the x-direction are shown in the 3 frames from bottom left (α = 0deg), through top right (α = 15deg) to bottom right (α = 30deg). Along the abscissa, projected distances perpendicular to the line-of-sight (dotted line) through the mass center (x = 0) are shown. All cells with densities n > 0.01   H   cm^-3 are included and re-arranged to represent the column density distribution in the observed position-velocity space (leading to the bubbled contour structure). The contour lines of the line-of-sight column densities indicate log (N_HI) = 18,   19,   20,and21   H   cm^-2. The measured maximum velocities differ accordingly from 215 (for α = 0deg) to 188    km   s^-1 (α = 30deg).