Fig. 1From: Cross-border mobility responses to COVID-19 in Europe: new evidence from facebook dataAggregate Traffic Deviations from Pre-Covid Levels. Source: Facebook data on daily border crossings. Notes: Y-axis represents the average of τijt, the percentage change (times 100) in the 7-day moving average traffic compared to t=0 over all destinations. The weights are the traffic levels observed in pre-Covid-19 period (i.e., t=0)Back to article page