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Fig. 6.

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Variance as function of frequency for the ten combined nights of the three redshift bins. The top line (blue) shows the Stokes-I power after sky-model subtraction (DD-calibration). The middle line (orange) shows the variance of the residual after ML-GPR, the bottom line (dark grey) show the thermal noise level estimated from the gridded time-differenced visibilities. Flagged channels are shown in light grey.

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