Before revision:  Usually, these measurements are characterized by the scaling of the contact probability as a function of the genomic distance between regions.
After revision:  These probabilities can be visualised as matrices called contact maps. Contact maps are characterized by self-similar blocks along the diagonal, corresponding to a hierarchy of tightly packed chromosomal domains. Statistical properties of these maps, and thus of chromosomal interactions, are usually summarized by the scaling of the contact probability as a function of the genomic distance between regions.