Distribution of mutual nodal distances. Upper panel: for the ascending mutual nodes of the sample of 19 NCs. The median is shown in blue and the 5th and 95th percentiles are in red. Bottom panel: for the descending mutual nodes of the same sample. In the histogram, we use bins computed using the Freedman and Diaconis rule (Freedman & Diaconis 1981) and counts to form a probability density so the area under the histogram will sum to one.