Comparison between the CO₂ ν₃ band observed by JWST at Tara Regio and the lab spectra of 10 keV electron-irradiated cryogenic CaCO₃. The black line shows the continuum-normalized, five-point smoothed spectrum from the center of Tara Regio (16°S, 79°W), with dashed lines marking the band centers at 4.249 and 4.268 μm (S. K. Trumbo & M. E. Brown 2023). Overlaid are the double Gaussian fits to the postirradiation lab spectra. Red dashed lines at 4.247 and 4.264 μm mark the wavelengths at 100 K.