Fig. 6
Comparison of the radial velocity of the Na I gas along the line-of-sight of iPTF16abc and H I in and around NGC 5221. The ALFA H I spectrum encompasses the position of iPTF16abc and NGC 5221. The Na I D1 profile is shown from the Apr. 24 UVES spectrum. Vertical dashed lines indicate the line-of-sight velocity of the two SDSS spectra with respect to the rest-frame of NGC 5221. The labels S1 and S2 corresponding to those in Fig. 1.
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