Distribution of OB type stars in the plane of the Milky Way as taken from the Reed (2003) catalog. The lower panels show the distribution of B type stars alone (left panel) with Vallée (2005) spiral arms super-posed (right panel). The same is shown in the upper panel, but for O type stars. The position of the Galactic center (GC) is indicated, and the Sun is located at (0.0, 8.5). With the symbols I, II, and III in the bottom-right panel we indicate the Scutum-Crux, Carina-Sagittarius, and Perseus arm, respectively.
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