Spatial distribution of the stars on the sky distinguished by their spectral types, as an approximate indication of their evolutionary stages. The symbols are as follows: red stars, O3-O5 V-I and O Vz; green squares, O6-O9 V-I and B0 I; blue triangles, B0-B2 V-III and B1-B8 I. The dashed lines contour the regions that are zoomed in the online version of the figure. Stars outside the contours are labeled with their ID numbers from Table 1. Stars inside the contours are identified in the corresponding figure of the online version.

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