Spectral profile of DCN J = 2−1 (black thin line) and H¹³CN J = 2−1 (red thick line) extracted over the whole emitting region displayed in linear-logarithmic scale. The thin/thick dashed lines show the fit to the spectral slope T_mb ∝ exp(− | v/v₀ |) for DCN and H¹³CN, respectively, with v₀ = 4.4 km s^-1, which corresponds to the signature of the g₂ outflow component identified by Lefloch et al. (2012).