Back to the Abstract

	1 Introduction
	2 Statistical methods
	3 Observations
	4 The models
	5 Application to the data
	6 Discussion
	7 Summary and conclusions
	References
	Online Material
	Appendix A: Radius and area of a cluster
	Appendix B: Normalisation of the minimum spanning tree
	Appendix C: Elongation of a cluster

	List of tables
	List of figures