Fig. A.1
Relative intensity of the telluric contribution to the CD-VI spectra at two wavelengths. Panel a: at 7618 Å with a strong telluric line, (b) at 7585 Å without significant telluric contamination. The dots were derived from a spline fit to every pixel versus time. The top smooth line is the low-order spline fit that represents the air mass changes during our observations. X-axis is time in UT.
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