Additional data. (A) Population density (people per square kilometer) per arrondissement in Senegal (2010). Regions (according to the 2005 subdivision) are numbered as follows: Dakar (1), Diourbel (2), Fatick (3), Kaolack (4), Kolda (5), Louga (6), Matam (7), Saint-Louis (8), Tambacounda (9), Thiés (10), and Ziguinchor (11). (B) Daily precipitation depth in 2005 averaged over all arrondissements. (C) Evolution of the total number of moving people (i.e., people leaving their home arrondissement) throughout 2005 according to variants I (blue), II (red), and III (green) (Model Selection). The first spike, present in all variants, corresponds to the GMdT. The four spikes present only in variant 3 correspond to the following events (in chronological order): Gamou de Tivaouane, Magal de Porokhane, Magal de Kazu Rajab, and Magal de Darou Mouhty.