Temporal evolution of the mid-IR SED during the flaring event. Top left: spectral-index variations. The dark gray shaded region is the total statistical uncertainty, while lighter gray denotes the total statistical + systematic range. Bottom left: intrinsic mid-IR light curves of Sgr A* in all four channels; the gray shaded region shows the statistical photometric noise in the measurement. The red and blue vertical bars denote times at which the time-resolved SEDs are plotted in Figure 1. Right panels: residual-extinction-corrected SEDs (see Appendix C) at different times during the observation. Each MIRI/MRS channel has been broken up into three equally wide frequency bins (connected points), and a best-fit power-law (solid lines) has been plotted. Shaded regions correspond to the statistical uncertainty in the measurement. The colors of data points in all panels correspond to the measured spectral indices.