Figure 14
Probability of finding a mobile phone user in a specific location. Probability density function \(\Phi(x,y)\) of finding a mobile phone user in location \((x,y)\). The plots, from left to right, were generated for users having a different radius of gyration. After rescaling based on the variance of each distribution, the resulting distribution show approximately the same shape. Figure reprinted by permission from Macmillan Publishers Ltd: Nature [97], copyright (2008)