The format is a list of 4 data frames. Each data frame gives the presence (1) and absence (0) of 10 species (columns, S1-S10) in 8 plots (rows P1-P8). These data are characterized by different levels of nestedness and turnover in species compositions between sites.
M1: Intermediate nestedness and turnover.
M2: Perfectly nested pattern.
M3: Very high species turnover.
M4: Random configuration.