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(a) The probability distribution of lockdown start and end dates in 577 global cities affected by COVID-19 (see Appendix for details) and (b) the distribution of the number of days in lockdown. In panel (a), the blue shaded area represents the global lockdown phase identified for this analysis (March to May 2020). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
