Histogram of the distribution of frequency pairs between the 187 selected peaks in the frequency analysis of KIC 6352430 situated above 4   d^-1. The histogram with a bin width of 2.5/T is plotted with red, while the histogram with a bin width of 1/T is plotted with a black solid line. The spacing δ₂f is marked with a black triangle, while Δ₁f and Δ₂f are marked with grey triangles.