Skip to main content
. 2019 Aug 23;9:12325. doi: 10.1038/s41598-019-48668-2

Figure 7.

Figure 7

The performance of multiple-city-upgrade. The changes of city visitation volumes, Δsi=sisi, by upgrading Chongqing-Wuhan-Nanjing (a), Jiuzhaigou-Lhasa-Lijiang (b), Xi’an-Guilin-Chengdu (c), and Hangzhou-Suzhouo-Shanghai (d). The tourism attractivenesses of the selected cities are increased by the same amount Δa. Black squares: Δa=20. Red circles: Δa=50.