Fig. 3.

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G magnitude distribution of the selected giants (red) and OB (blue) samples. Black and grey histograms show the subsamples with line-of-sight velocities for the giants and OB stars, respectively. The magenta histogram are OB stars for which the line-of-sight velocities were estimated with templates with a Teff > 7000 K. This sample was selected for mapping the velocities of the OB stars.
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