a) Synthetic probability distributions for the shock fronts as derived from the cosine model (see Sect. 3.2) and for different products nf ranging from 0.2 to 1 with ϕ_max = 60° (defined in Fig. 7). b) Corresponding shock front shapes (in the quarter x,y > 0) with the apex distance normalized to 1. c), d) Same graphs with ϕ_max = 30°.