Fig. 4

21-cm H i absorption spectrum for the target, plotted as a function of lsr radial velocity. The measured spectrum is divided by the continuum level and represents e−τ, where τ is the optical depth. The horizontal dashed line is drawn at Sline/Scontinuum = 1 and the vertical dashed line is drawn at an lsr radial velocity of 0 km s-1.
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