Figure 3

Cluster geographic distribution. (A) Cluster frequency for locations with more than 7 observed years. This map was created with the ggplot2 package33 in R34; (B) Yield response to plant density for: (B1) Group I (S): Southern latitudes (i.e., below 40.5 N), (B2) Group II (N): Northern latitudes (above 40.5 N). Clusters are numbered in increasing order, according to their yield distribution.