Fig. A.2

Difference spectra after removal of both the solar spectrum and the telluric absorptions from the observed spectra. The remaining residuals are then solely due to the first transmission through Earth’s atmosphere. Shown are all available CD-VI spectra. A vertical offset of 0.75 is applied for better visibility. Times on the left are start of exposure in UT. Wavelengths are in Ångstroem.
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