Interfold distance at null radial velocity vs. self-similar predictions for a fixed value of angular momentum. The distance dr between local maxima of the function f(r, υ_r = 0, j) is plotted as a function of r for the VlaSolve runs with various initial conditions. The time considered corresponds to the middle column of panels in Figs. 1 and 2. The two left columns of panels correspond to the “warm” case, η = 0.5 with j = 0.16, and the two right ones to the “cool” case, η = 0.1 with j = 0.06. Then, odd column numbers (1 and 3) and even column numbers (2 and 4) correspond to the regime where centrifugal/gravitational force dominates, respectively. On each panel a red line indicates the logarithmic slope predicted by self-similarity. When the gravitational force dominates, two additional dashed curves provide a bracket of the estimated slope taking into account deviations from self-similarity, i.e. variations of the effective logarithmic slope of the gravitational force.