Figure 2.

Schematic representation of a path graph used to avoid edge effects in the estimation of λ and K via the island method. The n × n scoring lattice (gray square in the middle) is surrounded by a border of width b. Only islands that are anchored within the central n × n area (shown in dark red) are counted. Islands anchored outside this area (green) are ignored. Note that some of the ignored islands reach into the inner area and some of the accepted islands reach into the border region since the classification of an island depends only on the position of its anchor (circles); borders thus are required on all sides to suppress edge effects properly.