Fig. 3
Spatial distribution of the 1699 Hα emission stars in our M 42 survey. The patches that are empty of stars in the central region are located where the HII region is very intense, complicating the detection of Hα emission-line stars. Stars with an Hα value of 1−2 are plotted with green triangles and 3−5 as red dots. See text for a discussion.
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