Coherence scales of the mode-mixing foreground GPR components for the three different redshift bins. The baseline dependence of the coherence scale is defined by Equation (10). Based on the estimated values of the θ parameters for the mode-mixing components, the coherence scales range approximately between 8 MHz and ≈2.5 MHz for redshift bins 8.3 (green line) and 9.1 (orange line). For redshift bin 10.1 (blue line), two mode-mixing components are required, yielding coherence scales ranging approximately between 10 MHz and 4 MHz for the first component (solid line), and between 3 MHz and 1 MHz for the second (dashed line).