Fig. 12: The structure of the coupled coordination space network in the YREB.

The sub-figures a, c, e, and g denote the direction of emitting linkage lines from city A to B in the years 2005, 2010, 2015, and 2020, respectively; The sub-figure b, d, f, and h denote the direction of emitting linkage lines from city B to A in the year of 2005, 2010, 2015, and 2020 respectively.