Fig. 1.
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Spectra of the three absorption profiles. From top to bottom: NVSS J005245−311503 in NGC 289 (J0052−31), SUMSS J225729−410241 in NGC 7424 (J2257−41), and SN2001ig also in NGC 7424 (J2257−41). The original spectra are shown in black, with a five-point Hanning-smoothed version overplotted in red. The 0, ±1σ, and ±2σ levels of the unsmoothed spectrum are indicated by solid, dashed, and dotted lines, respectively.
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