Plots of the normalized frequency of occurrence of Hα velocity dispersion versus star-formation intensity in two redshift bins, z < 1.8 (left) and z > 2 (right) (cf. Fig. 9 for the whole sample). The normalizations are different from that used in Fig. 9 and in the left and right panels. For both sub-samples, the average star-formation intensity of each galaxy was shifted to the average of its ensemble of galaxies (0.16 M_⊙ yr^-1 kpc^-2 for z < 1.8 and 0.73 M_⊙ yr^-1 kpc^-2 and z > 2). Note that the two sub-samples tend to sample different ranges in both velocity dispersion and star-formation intensity. The green  ×  and blue  +  symbols represent our simulated data after beam smearing, assuming that the two quantities plotted are related as σ = (ϵΣ_SFR)^1/2 km s^-1 and σ = σ_sim, respectively. The green and blue model points have been shifted to overlap with the data (the location of the modeled points along the axis of Σ_SFR is set by the coupling efficiency of the mechanical energy output of young stars to the ISM).