Galactic longitude distribution of the HGPS sources (gray histogram). The bin size of this histogram is 5°. For comparison, the 3FGL and 2FHL source distributions (smoothed with a Gaussian of width 5°) and the Planck measurements of CO(1-0) line emission as an estimate for matter density in the Galaxy (smoothed with a Gaussian of width 2.5°) are shown for the range in Galactic latitude b ≤ 5° and normalized to the area of the histogram. Spiral arm tangent locations shown are from Vallée (2014).
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