Figure 1

Probability distribution functions (PDFs) for gaps and call durations. (a) PDFs for inter-call times (gaps), \(\tau_{ij}\) and PDFs for the average gaps, (\(\langle\tau\rangle_{ij}\) - calculated with respect to individual pairs ij). The pairs (ijs) are chosen irrespective of the age and gender of the individuals in the pair. The green up-triangles and blue down-triangles correspond to \(\mathcal{U}\) (set of all frequent contacts). The red circles and the orange squares correspond to \(\mathcal{S}\) (set of regular contacts). (b) PDFs for call durations, \(T_{ij}\) and for the average call durations, (\(\langle T\rangle_{ij}\)). The different symbols are used in the same sense as in (a).