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Fig. 3.


Top: distance estimates (1/ϖ) for YSOs in Orion A versus l and their average distances per Δl. YSOs are shown as red dots with error-bars (σϖ/ϖ2). Over-plotted are the median (blue diamonds) and mean (orange circles) distances per Δl = 1° (blue/green vertical lines on the bottom map correspond to the bin boundaries, factor two over-sampled). The 1σ and 2σ lower and upper percentiles are shown as blue shaded areas. The horizontal gray line represents the Menten et al. (2007) distance to the ONC at 414 pc with a range of ±20 pc (gray shaded area) corresponding to the projected extent in l of the cloud (∼40 pc at 414 pc). Bottom: distribution of the YSOs in Galactic coordinates projected on the Herschel map. The displayed area corresponds to the VISTA observed region (Meingast et al. 2016). The dark shades of the gray scale indicate regions of high dust column-density (or high extinction). The distribution of YSOs follows the high density regions of the cloud, shown by their mean (b) positions per Δl (orange squares).

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