Moment-0 (upper panels), 1 (medium panels), and 2 (bottom panels) for the disk Petunia at 60 deg obtained from the simulated cube (Col. 1) and the mock cubes described at points a) – d) in Sect. 4 (Cols. 2–7) at different angular resolutions (the beam is shown in the bottom left corner as the gray ellipse). In the mock moment-0 maps, the white contours are at 2 and 10 times the rms noise and the color bars are in units of 10 mJy pixel⁻¹ km s⁻¹ in the first column and 100 mJy beam⁻¹ km s⁻¹ for the mock observations.