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. 2016 Nov 18;6:37510. doi: 10.1038/srep37510

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Copyright © 2016, The Author(s)

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Intensity time-series (normalized to zero mean and unit variance) for I/I_th = 0.97 (a) and 0.98 (b). Note the different time-scale with respect to Fig. 1. In panel (a) the depths of the dropouts are heterogeneous and there are dropouts below −9σ. In panel (b) the dropouts are of similar depth and they are less pronounced. The panels (c) and (d) display a detail of a single dropout: it is abrupt in (d), while is more gradual in (c). The horizontal dashed and solid lines in panels (c) and (d) stand for the 3σ level and the average value respectively.