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. 2014 Aug 20;9(8):e105407. doi: 10.1371/journal.pone.0105407

Figure 2. Histograms of total lengths by country of highways and railways.

Figure 2

(a) Highways total length by European countries. (b) Railways total length by European countries. (c) Ratio between the total length of highways and that of railways by several European countries. The red line marks the unit ratio.