Four cases of the predicted luminosity history for different values of the model parameters representing the decay and the variability level with a reasonable mean luminosity and the range in its variation. Constraining data values are shown by red squares (based on X-ray data from Ryu et al. (2013), plotted here without the errorbars) and green triangles (based on Capelli et al. 2012). The model lightcurves are plotted by a blue continuous curve. The interplay of model parameters determines the level of mean luminosity, frequency of the oscillations, and the rate of final decline at the moment when the accretion ceases. Top-left panel: M_tot = 0.1  M_⊙, t_visc = 0.24 yr, N = 200, μ = 2/3, η = 10^-3, η_X = 0.1. Top-right panel: M_tot = 0.1  M_⊙, t_visc = 0.24 yr, N = 200, μ = 2/3, η = 10^-3, η_X from Eq. (16). Bottom-left panel: M_tot = 0.025  M_⊙, t_visc = 3 yr, N = 20, μ = 2/3. Bottom-right panel: M_tot = 0.075  M_⊙, t_visc = 3 yr, N = 20, μ = 1.3. In the last two cases, η was determined from Eq. (14) and η_X from Eq. (16).