Fig. 6
From: Cross-border mobility responses to COVID-19 in Europe: new evidence from facebook data
Distribution of Weights. Sources: Numbers of daily commuters are extracted from Eurostat data by Nuts2 region in 2019; Numbers of air passengers are extracted from Eurostat monthly statistics on air passenger transport on March 1, 2020; Data on international migrants are extrapolated from [34] for the year 2015, assuming a conservative 50% growth in the flows between 2015 and 2020. Notes: Countries on X-Axis are ordered as countryicountryj, thus linked to ωi→j. The opposite weight ωj→i=1−ωi→j refers to the weight of countryjcountryi