Fig. 2: SARS-CoV-2 introduction events into Spain.
From: International importance and spread of SARS-CoV-2 variants Alpha, Delta, and Omicron BA.1 into Spain
Circular migration flow plots based on the Markov jumps between different countries and Spain (a: Alpha; c: Delta; e: Omicron-BA.1). Mean and number of transitions from those countries to Spain, computed from all the trees from the posterior distribution. The error bars represent the 95% highest posterior density (HPD). The width of the violin plots represents the density of observations, derived from 638 M, 794 M, and 1388 M generations for Alpha, Delta, and Omicron-BA.1, respectively (b: Alpha; d: Delta; f: Omicron-BA.1). Codes ISO 3166-2 AD, IN, UK, and US correspond with Andorra, India, the United Kingdom and the United States of America, respectively.
