Example of the cloud reflection correction results of the 2021 October impact flash (PONCOTS flash) data. (a) Relative spectral responses of the three PONCOTS bands, V, Gh, and CH₄. (b) A SED obtained during the peak phase of the flash, overlaid with its cloud correction results and the best-fit model spectrum. Crosses and points with error bars represent observed fluxes and those after cloud-reflection correction, respectively. The best-fit spectrum of single-temperature blackbody radiation with a best-fit temperature of 8300 K is shown as the solid line. The dashed line corresponds to the expected total observed flash spectrum, including the cloud reflection contribution.