Download link: 6160x5432 (16.3 Mb) version
Warning - right click to download as the image is likely too large to view in your browser.
This shows the full 3-dimensional velocity map hemisphere for the cold atomic hydrogen (1 °K) in the direction of the galactic anticentre (outer galaxy).
You can also see a version of this image dissected to show the warmer atomic hydrogen gas within the cold shell here.
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.