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 (NHI) = 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 (NHI) = 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).
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