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The particle descent speed was incorrect by a factor of ten, and should read, 'Steady descent of particles at about 5 cm s−1 continued throughout the morning' in the abstract and 'Using a linear regression fit to the plume height in figure 3, the fall rate is (177 ± 4) mhr−1, or ∼5 cm s−1' in section 3 (instead of 50 cm s−1).