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Summary of transmission chain size and duration against the time of the first sample from each chain, Nordic countries, up to 22 March 2021 (n = 67,918 genomes)
Trend lines are fitted here to one of 10 replicates, with dotted lines corresponding to trends that were not repeated in at least nine of 10 replicates. Trends are omitted for Iceland due to low sample size. Trends are split on either side of 31 August 2020.
