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. 2021 Dec 4;20:46. doi: 10.1186/s12942-021-00299-5

Fig. 4.

Fig. 4

Relative changes in the average population density of daytime Facebook users within London under different mobility restrictions. A Lockdown one (05/04/2020–12/05/2020). B Summer 2020 (05/07/2020–31/08/2020). C Lockdown two (05/11/2020—01/12/2020). D Lockdown three (05/01/2021–08/03/2021). Time period is between 08:00—16:00 UTC. Data does not coincide with the beginning of lockdown one as data collection did not commence until 05/04/2020. The change is relative to a pre-COVID baseline (see Methods for details)