Fig. 4
Histograms showing the total number of individual maser features observed in the λ3 mm v = 1, J = 2−1 (January 24, 2011) and λ7 mm v = 1, J = 1−0 (all 19 epochs; Matthews et al. 2010) emission and their positions relative to Source I. The histogram bin width is 1 AU for λ7 mm, and 5 AU for λ3 mm due to the low number of features.
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