Figure 4From: Spatial heterogeneity of the relationships between environmental characteristics and active commuting: towards a locally varying social ecological model Map view of the first two components derived from the principal component analysis and kept as explanatory variables. A. The first component (PC1) refers to the built environment (densely built-up areas and facility density) and is characterized by high values in Paris. B. The second component (PC2) is related to the socio-economic environment (high values indicate well-to-do areas).Back to article page