Fig. 9.
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Top: Intrinsic absorption spectrum in NGC 7424 towards SUMSS J225729−410241 derived from the absorption-only data cube. The upper sub-panel shows the spectrum as optical depth τ. The dashed line marks zero optical depth, and the dotted lines indicate the ±1σ levels. Two Gaussian components are overplotted. The lower sub-panel shows the residuals with respect to the fit. Bottom: Absorption spectrum towards SN2001ig. Lines and symbols are as in the top panel.
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