Fig. 2

Mean principal component scores representing the surface experience of players from countries with ≥ 20 respondents. Marker types represent the six k-means clusters. Cluster 1 (white diamond) Japan, Hong Kong, Sweden, Iceland, Russia, Morocco; Cluster 2 (white down-pointing triangle) Zimbabwe, Chile, Ivory Coast, Peru, India, Singapore, Namibia; Cluster 3 (multiplication sign) Papua New Guinea, Jamaica; Cluster 4 (white up-pointing triangle) Mexico, Argentina; Cluster 5 (white circle) Botswana, Democratic republic of Congo and Cluster 6 (plus sign) United Kingdom, New Zealand, France, Germany and Portugal