Fig. A.1
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The B44 and B45 filaments and the L1688 cloud containing a cluster of embedded protostars (red circles). The linear distribution of protostars in the L1688 cluster is orthogonal to the projected line-of-sight to σ-Sco, suggesting star formation in a compression front. The head of B45 (L1709) is radially aligned with σ Sco, while B44 is radially aligned with Elias 2-9 (HD147889).
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