Correlation between velocity dispersion (σ_tot) and the plane-of-sky projected radius (R) for 15 protoclusters. The red dots represent structures derived using the astrodendro module. The solid blue lines represent the fitted lines for the correlation and the green shaded areas represent the ±3σ regions around the mean fitted values. Symbols Y, I, and E in the figures indicate young, intermediate, and evolved protoclusters respectively (see Section 1).