Fig. A.2.
J0815+2640: The Ca II H and Na I D lines are clearly detected. We conservatively give an upper limit for the Ca II H line in Table 2. The Na I D line is somehow blended with telluric absorptions. We therefore have subtracted the sky contamination from the EW. The Mg Iλ2852 feature is strongly blended with absorption from the sky. Weak lines from the Ni II triplet are detected.
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