Figure 5
From: From mobile phone data to the spatial structure of cities
Time evolution of the number of mobile phone users per hour during an average weekday (a) Total number of unique mobile phone users per hour (shown here for the eight biggest Spanish cities). (b) Rescaled numbers of unique users per hour for 31 cities. Each value Ui(t) is equal to the number of phone users in city i at time t, Ni(t), divided by the total number of phone users in i during the entire day: 
. The good collapse suggests the existence of an urban rhythm common to all cities. This figure was created with R and LibreOffice Draw.
