Time series of Stokes-I spectra around umbral eclipse. Wavelengths are given in Ångstroem, individual spectra are offset by 1.0in intensity for better viewing. Shown is the entire wavelength range of CD VI. Notice the deepening of the O₂ A-band absorption at 7600 Å during umbral eclipse between UT 4:46 and 5:50. Its absorption became so dominant that no light at these wavelengths was left except a residual emission feature at 7618 Å. Increased absorption line strengths of other molecular bands are also seen, most notably for the H₂ O bands between 7850–8450 Å.