Test examples of the time dependence of the iron Kα reflection spectral line flux from the model of Sgr B2 cloud reprocessing (continuous lines), together with the data points from Yu et al. (2011; shown by squares and the corresponding measurement error bars). The constant density model was used with parameters as follows. Left panel: the accretion model as in the top-left panel of Fig. 4, R_cloud = 0.25 pc (red line) and R_cloud = 0.50 pc (green line); obviously this example does not produce a reasonable solution because either frequency or the amplitude of oscillations do not correspond with the data. Right panel: as in the bottom-right panel of Fig. 4, R_cloud = 2.3 pc; the latter example provides significantly better agreement with the data for which the formal χ² test converges to an acceptable fit.