A description of the simulated point patterns used to test the algorithm.

The parameter a is chosen so that each point pattern contains approximately 3,000 points. Parameters b and c determine the amount of clustering; larger numbers produce more clustering.参数a的取值需确保每个点模式（point pattern）包含约3000个点。参数b与c用于控制聚集强度，数值越大则聚集效果越显著。