Model fit for troughs variation in component 3 (see Sect. 4.3.2). The normalized data is shown in red for the 2010 epoch and blue for the 2015 one. The full model for each trough is shown by the dotted lines of the same color. In green we show the contribution of component 3a (left curve) and 3b (right curve). For the blue doublet components (left panels) we show the contribution of the 2 phases to the 2010 model, and for the red doublet components (right panels) we show the contribution of the 2 phases to the 2015 model.