Spectral profiles of C¹⁷O 3–2 at two spatial positions: one beam west-southwest of source B (blue “ × ” mark in Fig. 2) and within the bridge filament (magenta “+” mark in the same figure). The frequency of the species of interest is marked by the blue, vertical dashed line; other lines identified in the frequency range are marked with dotted, dash-dotted, or solid lines. All rest frequencies are shifted by + 2.7 km s⁻¹ to account for the systemic velocity of source B. The section of the velocity axis with white background denotes the maximum range over which intensities are integrated.