Fig. 3From: Tracking social contact networks with online respondent-driven detection: who recruits whom?Distribution of recruitment and commuting distances. Black triangles indicate distances between recruiters and their recruits, with median 2.8Â km (mean: 20.7; SD: 38.3). Blue squares indicate distances participants commute to work, with median: 3.4Â km (mean: 11.0; SD: 18.1)Back to article page