Distribution of the core linewidths from DCN single-type line fits as a function of protocluster distance (left). The red triangles, blue plusses, and black crosses represent the linewidths of core emission associated with evolved, intermediate, and young protoclusters, respectively. There is no obvious dependence on the protocluster distance and the linewidths. Right: Histogram of the linewidths from the DCN line fits grouped by evolutionary stage, where the solid red, blue dot-dashed, and black dashed lines represent the evolved, intermediate, and young protoclusters, respectively. The vertical lines display the mean linewidth for each evolutionary stage with the same colours described above. The evolved regions have a slightly smaller average linewidth (1.2 km s⁻¹) than young and intermediate regions (∼1.5 km s⁻¹), significant within the standard errors.