Figure S1. The countries/regions skipped by Alpha strain (e.g., India) had a mild 2020 year. The synchronized \(T_{\alpha\rightarrow\sigma}\)coincided by a trough of deaths in European countries. Here we show population standardized daily data (daily reported COVID-19 per 1 million population). A bright band (low deaths) can be seen in June-July 2021, when Delta invaded. Data are obtained from https://covid19.who.int/info/.