Excess variance power spectra ratios (i.e., the Stokes I over Stokes V ratio) for the 13 nights of LOFAR observations after DI and DD calibration and foreground removal (sky model and GPR). The dashed lines indicate, from bottom to top, the 5° (the primary beam), 20°, and instrumental horizon delay lines. The excess variance is larger in the wedge-like region under the dashed lines. Some baselines are flagged in L205852 (k_⊥ ~ 0.07 hc Mpc^–1) and in L253987 (k_⊥ ~ 0.05 hc Mpc^–1).