Connectivity of the bistable region.

Details of the initial connectivity graphs for the indicated values of σ in column 1. Column 2 gives the number of bistable points in the set used to construct the graph; column 3 gives the number of connected components in the resulting connectivity graph; columns 4 and 5 give the sizes of the largest and second-largest components of the graph, respectively; column 6 gives the number of singleton components; and column 7 gives the size of the largest component as a percentage of the number of bistable points in the sample. The numbers show that the connectivity graphs consist of one large component and many very small components, suggesting that the bistable region is connected for all examined values of σ. Details of the connectivity graphs obtained through refinement with additional sampling (Results, Materials and methods) are given in S1 Appendix.