Second-order 2D structure functions of emission measure fluctuations (top panel), velocity (middle panel), and velocity dispersion (bottom panel) as a function of distance for the three ℳ = (0.25, 0.5, 0.75) simulations (green, blue, and red, respectively). In each plot the measured SFs derived from our simulated X-IFU fields (filled dots with error bars) is compared to those of δ, v_ew, and w_ew (see definitions in Eqs. (3), (5), and (6)) derived directly from the hydrodynamical simulations in the same field of view (solid lines). Error bars represent the error on the mean computed with 100 bootstrap samplings (in most cases smaller than the dot size). Open circles indicate the values of the measured SFs without the statistical error subtraction (see Eqs. (17) and (18)). The FOV covers only a small fraction of the cluster, namely the core region.