Distribution of the core velocities from the DCN line fits split by evolutionary stage. The velocity offset is determined as the central velocity of the fit and subtracting from it the average protocluster velocity (estimated from the average of the DCN (3–2) moment 1 maps). The vertical dashed lines are the average values for each subgroup (0.13 km s⁻¹, −0.29 km s⁻¹, and 0.44 km s⁻¹ for the young, intermediate and evolved regions, respectively). We find no obvious dependence on the distribution of the core velocities over the sample.