Fig. 1: Map shows the North American tree-ring fire-scar network (NAFSN)29 sites used in this study.

Also shown are ecoregions and the 120 hexagonal polygons (‘hexels’) used in our analyses. Hexel dimensions: 200 km diameter; 34,641 km2.
Also shown are ecoregions and the 120 hexagonal polygons (‘hexels’) used in our analyses. Hexel dimensions: 200 km diameter; 34,641 km2.