Fig. B.1

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Massive stars toward Orion and dent geometry. Left: SOFIA [С II] map of Orion with О−, B−, and A−stars found in SIMBAD. The blue-, orange-, and red-filled circles are О, B, and A stars, respectively. White open circles indicate the dents identified in this work. Right: Geometry we used to calculate the collimation factor and opening angle (a).
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