Fig. 3. (a) Cumulative distribution of cluster areas, A, determined for the shrub vegetation shown in Fig. 2a, b. (b) Distributions of cluster areas calculated for the vegetated areas shown in Fig. 2c, d. The distributions obtained for model-simulated vegetation patterns (Fig. 2a,c) closely match those observed in two examples of shrubland ecosystems (Fig. 2b, d).