DCN (3–2) centroid-velocity (top-left) and linewidth (top-right) maps from the blueshifted component in the hyperfine structure fitting (see Appendix D). The white contours show its peak intensity. The contour levels start at 25σ and increase in 5σ step, where σ = 0.3 K. The blue contour shows the ALMA 1.3 mm continuum emission at the 3σ level. Spectra of DCN (3–2), C¹⁸O (2–1), and CH₃CN (12₃–11₃) toward the four positions marked in the right panel (bottom). The blue bars show the relative intensities of the DCN (3–2) hyperfine structure at the velocity of the blueshifted component (see Appendix D).