Figure 2

Heat map of collected geo tracking data of participants of five clubs of the Austrian Bundesliga (time period: June 17th 2020–July 30th 2020). The color gradient can be interpreted as follows: areas with high movement frequencies are displayed with red, areas with less movement frequencies are colored with blue. Heat map created using R version 3.5.2, R Core Team, 2018 (https://www.r-project.org/); country map drawn with package ‘maps’, original S code by Richard A. Becker, Allan R. Wilks. R version by Ray Brownrigg. Enhancements by Thomas P Minka and Alex Deckmyn. (2018). maps: Draw Geographical Maps. R package version 3.3.0 (reusable under GPL-2 License).