Scale-by-scale kinetic energy budgets Eq. (8) from sub- to supersonic conditions. The different terms of the KHM equation are normalised by 4ϵ_f while the separation is divided by L ≡ 1. The colour code is same as in Fig. 7a. The shaded regions represent the statistical error. Panel (a) is for Ma = 0.25 and Ma = 0.5, the symbols are the results obtained from an incompressible code. Panel (b), (c) and (d) are for Ma = 1, Ma = 2 and Ma = 4, respectively.