Fig. 2
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Recovery of a reference spectrum for comet #1 (1997-12-06, grey area) in the Al III 1862 Å line. Unlike other lines, we did not try to recover the EFS. Instead, a continuum is fitted to the observed spectrum (using a cubic spline algorithm), which corrects for the perturbation of broad, shallow exocomets, undetected in other lines.
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