Combined UVES spectra of CoRoT-7 showing the Na i D2 line and interstellar absorption. After subtracting a Voigt profile (dashed red) from the data (blue) the blueshifted absorption feature becomes visible in the residuals (solid red); the RV shift of the interstellar feature ( + 19 km s-1) and the CoRoT-7 system (+31 km s-1) are marked by vertical, dashed lines. The absorption lines in the outer parts of the line wing are due to Fe i.
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