Figure 1From: Spatiotemporal distributions of population in Seoul: joint influence of ridership and accessibility of the subway systemSeoul Metropolitan Subway system. Each station is represented by a (blue or red) dot whereas the (black) solid line depicts the boundary of Seoul City. Accessibility, as well as the number of passengers at each station, is obtained from the data for the whole subway system. In the case of population, 289 stations (blue dots) inside Seoul out of 615 stations are used since the population data are available only for SeoulBack to article page