Top panels: ion velocity structure functions S_u, p (in log-scale) of sim.1 at (a) and of sim.2 at (b); dashed straight lines represent the power laws r^p, and the vertical dash-dotted lines separate the power law-like region from the saturation region. Middle panels: S_u, 4 vs. S_u, 2 (filled black dots, in log-scale) for r <  7 d_i from sim.1 at (c) and sim.2 at (d); these curves were fit with a straight line (in magenta). Bottom panels: ion velocity scaling exponents β_u(p, 1) in range r <  7 d_i from sim.1 at (e) and sim.2 at (f); the dashed straight line, representing the self-similar scaling β(p, 1) = p, is given as reference.