Mean distance to the nearest galaxy (in physical coordinates) in various volume-limited samples together with 68% confidence limits (dotted green lines with shaded areas) as a function of redshift. For comparison, the mean distance to the nearest galaxy in the flux-limited sample is shown (dashed red lines). Dash-dotted blue lines show the LL scaling relation as found for the flux-limited sample, and solid black lines show the LL we used for volume-limited samples (in physical coordinates).