Fig. 2.

Gene distance does not solely explain the occurrence of coexpression. Gene distance, defined as the length in nucleotides from the annotated end of one gene to the annotated start of the next gene relative to the strand the genome that is given, with annotated start always smaller than the annotated end. X-axis is the averaged gene distance (in base pair) in each 1,000-pair bin. The Y-axis depicts the number of pairs (A, D), number of coexpressed pairs (B, E) and the fraction of coexpressed pairs (C, F), relative to the total number of pairs in each orientation (tan: tandem pairs; div: divergent pairs; con: convergent pairs) in each 1,000-pair bin