Rank ord.: rank order of the categories; chor.cat.: chorological categories; rel.ab.: relative abundance of each category; GMBP: step by step cumulative sum (left) for getting the numbers (right) used to draw the Graphical Model of Biogeographical Peculiarity (Figure 1); IBP′: sum (first six cells) and computation (bottom separate cells) of the Index of Biogeographical Peculiarity (in bold).