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Fig. E.1

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Velocity integrated HC3N (8 − 7) line emission, from 9.2 to 11.2 km s−1. White dashed contours correspond to the filaments identified in NH3 emission by P15 and S21. White solid contours outline the edges of the condensations labeled as in P15. The gray star marks the position of the protostar B5-IRS1.

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