Fig. 2.
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Effect of unsubtracted sky lines on RV determination. Left panel: Pa-11 line profile for W17 (20/06/2008) with unsubtracted lines at −75 km s−1 and +160 km s−1. Right panel: the same Pa-11 line after the sky lines were removed. In each panel, the RV and goodness-of-fit metric R2 derived from the Levenberg-Marquardt method are listed, demonstrating the reduced error and improved fit following sky line removal.
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