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

Figure 9. Box plots of the distribution of rail passenger-kilometers expressed in percentage of total inland passenger-kilometers according to the proportion of tweets on the rail among the tweets on the road and rail.

Figure 9

The red color for countries having a proportion of tweets on the rail less than 0.5. The blue color for countries having a proportion of tweets on the rail higher than 0.5.