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Fig. 3 Climate diagram based on climate data from the Ouahigouya station during the period
1961–2015 (Source Agence Nationale de la Météorologie du Burkina Faso)
Fig. 4 Number of dry spells (a) and (b) and dry spell lengths (c) and (d) at the Tillabery and Gaya
stations in Niger (Nassourou et al. 2018)