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This shows the full 3-dimensional velocity map hemisphere for the cold atomic hydrogen (1 °K) in the direction of the galactic centre. The image also shows a huge atomic hydrogen cloud that I believe surrounds the small and large Magellanic clouds, satellite galaxies of our own Milky Way.
The data is taken from the LAB HI survey (Leiden/Argentine/Bonn atomic hydrogen survey), the most detailed all-sky survey available on the atomic hydrogen gas in the Milky Way galaxy.