Atlas of galactic neutral hydrogen

the long version

This Atlas of Galactic Neutral Hydrogen contains maps showing the distribution of emission from atomic hydrogen, the principal component of the interstellar medium in the Milky Way, as measured over a five-year period with the 25-meter radio telescope of the Netherlands Foundation for Research in Astronomy. Each map corresponds to a particular velocity interval. The maps are displayed in several projections. The Leiden/Dwingeloo survey covers the entire sky above declination [actual symbol not reproducible], on a half-degree grid, over a velocity range of 1000 kilometers per second at a resolution of 1 kilometer per second. The limiting brightness temperature sensitivity is less than 0.07 K.