Median, 68% and 95% range of distances of M_UV ∼ −19.3 galaxies (the median in our sample) to the neutral IGM, D_b as a function of ${\overline{x}}_{\mathrm{H}\mathrm{I}}$ from the simulations used in this work (see Section 2.1.1Lu et al. 2024). The median D_b closely tracks the characteristic (mean) bubble radius in the simulations (blue dashed line), and shows a very broad distribution as the size distribution of ionized bubbles is broad (see Figure 1) and galaxies can sit in a range of locations inside bubbles, not always in the centre.