Example of overlap map for ζ30 and a threshold value t = 0.2. The left panel is the true t_reion field (top) and the predicted t_reion(r) for a z_obs of 10 (bottom). The middle panel depicts a 1 or 0 map where 1 (yellow) stands for the pixels fitting 20 % of the highest values and 0 (purple) for pixels below the threshold for the true field (top) and the predicted field (bottom). The right picture is the overlap of the middle panels, where yellow stands for coincidence, green for incorrect pixels in the prediction, and purple where the values are below the threshold in both fields.