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Fig. 1

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Positions on the sky of the Herbig disk sample used in this work shown as the gray markers. The numbers next to the markers correspond to the numbers in Table 1. The background is an IRAS 100 μm image (Neugebauer et al. 1984). The positions of six disk surveys are also indicated: σ Ori (Ansdell et al. 2017), ONC (Eisner et al. 2018), OMC-2 (van Terwisga et al. 2019), λ Ori (Ansdell et al. 2020), NGC 2024 (van Terwisga et al. 2020), and L1641 and L1647 (SODA, van Terwisga et al. 2022).

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