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Dust storm occurrence frequency map for Ls = 120°–180° of MY 24–31. Topography is indicated by contours. The ASV region is enclosed in a black box. Time mean winds at z ∼ 0.6 km (corresponding to σ = 0.9426 in MACDA) for Ls = 120°–180° of MY 25–26 are overplotted as vectors.
