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Fig. 15
Low-resolution version of the YSO density in Orion. The grey area at ℓ ≃ 205° is the Orion OB Ib association, while the lighter area to the right (around ℓ ≃ 201°) is OB Ia, containing the 25 Ori cluster (the grey spot at ℓ ≃ 201° and b ≃ −18°).
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