Ratio of the data to the model for the best fit of five of the eight multiwavelength observations of the decaying phase of outburst 4 (MJD 55613 in blue, 55617 in red, 55620 in black, 55630 in green, and 55639 in violet). Top panel: all fits were done simultaneously, fixing the parameters of Eq. (2) to those found in the rising phase: , α = −0.66, and β = 1.00. Bottom panel: fixing α and β to the values found for the rising phase, is free to vary and converges to the value 2.0 × 10⁻⁷.