Measured growth rates for simulations using different resistivity parameters η in the resistive current density, Eq. (29), and for different reconstruction schemes (MC: magenta, MP5: red, MP7: blue, MP9: black) as a function of the numerical resolution. Thick lines in the background show the fits obtained in Sect. 2.2 for numerical simulations without any added resistivity (see Fig. 3). As η is lowered, the effect of numerical resistivity emerges (especially in the bottom left corner of the panel). Dashed gray lines mark the values of the growth rates corresponding to the values of η used in the different series of simulations, computed using Eq. (19).