Velocity integrated HC₃N (10 − 9) emission. HC₃N is integrated 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. The black square represents the area observed with ALMA. The blue and red arrows indicate the direction of the blueshifted and redshifted lobes of the outflow in B5-IRS1 (Zapata et al. 2014).