Fig 4. The community structures of 5-min time scale and 4-hr time scale for the three time periods.

Sub-figures (a)– (f) represent the community structures of 5-min and 4-hr time scales for the three time periods. From top to bottom are those for 2016-2018, 2018-2020, and 2020-2022, respectively. Left are those of the 5-min time scale, while right are those of the 4-hr time scale. The abbreviations of the business sectors are introduced in the caption of Table 2.