Ratio of the power spectrum with respect to RAMSES (with AMR). In black lines we show results for RAMSES PM (no AMR), while in blue, orange and green we show results for PySCo using multigrid, FFT and FULL_FFT solvers respectively. In top, middle and bottom panels we use 512³, 1024³ and 2048³ cells respectively for PySCo. In dashed and solid lines we plot results using five- and seven-point gradient operator. The grey shaded area show the ±1% limits. We use TSC in any case, and we do not plot FULL_FFT for n_cells = 2048³.