Figure 4.

Estimates derived from borderless n × n sequence comparisons by the island method as a function of 1/n. Approximately 1 000 000 islands with a score of at least 37 were generated to produce the estimates, which thus have a standard error of 0.1%; the size of the symbols represents one standard error. The plotted line represents the theory of equation 9 for the apparent (n,n). The scoring system and random sequence model are the same as those described in the legend to Table 1.