Amplitude mode growth of models KH₁ (p = 0) and KH₂ (p = 0.7) of Table 5. The solid red line is the reference solution (McNally et al. 2012) obtained with the PENCIL code (Brandenburg & Dobler 2002), while the solid green and blue lines were obtained with SPHYNX for two different values of the p parameter. The dashed lines correspond to calculations performed with the NDSPMHD code (Price 2012) with a resolution of 512² and kernel B₄ (pink) and B₆ (light blue). See McNally et al. (2012) for further details. We also show the L₁ errors with respect to the reference values for each calculation.