Distributions of emission and null lengths of PSR J1709−1640. Pairs for the emission and the following null are denoted EN and are represented by red “o” symbol, while pairs for the emission and the pre-null are denoted NE and are represented by blue crosses. Nulling degrees, α₁ and α₂, and nulling scales, s₁ and s₂, are indicated for EN and NE. The correlation coefficients between emission and null lengths are shown in the top right corner. Histograms for the emission and null lengths are drawn in the top and right panels. Lengths of the longest emission or null state and their most probable and mean values are indicated in each panel.