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Soft X-ray Diffuse Background: Galactic Neutral Hydrogen

Map of the column density of Galactic neutral hydrogen in the same projection as Figure 1. Note the general negative correlation between the 1/4 keV diffuse X-ray background of Figure 1 and the neutral hydrogen column density shown here.

Credit: Dickey and Lockman 1990, ARAA, 28, 215

Neutral hydrogen in our galaxy

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