The plots in Figure S1 were generated using graphical visualization tools at outbreak.info (Gangavarapu et al., 2020) and Microsoft Excel v16.47.1 and edited in Adobe Illustrator 23.1.1, using data from GISAID (Elbe and Buckland-Merrett, 2017; Shu and McCauley, 2017) and the California COVID-19 data tracker (CDPH (California Department of Public Health), 2021b). Other figures were generated using R v4.0.3 and Python v3.7.10 and edited in Adobe Illustrator.
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