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Fig. 9
Hα image (Gil de Paz et al. 2003) superimposed with the H i emission. White contours show the H i emission at 
resolution, integrated across the velocity range 800–770 km s-1, and correspond to 5, 10, 20, 40 × 1020 atoms cm-2. The black line shows the pseudo-3σ contour of the total H i map at 5′′ resolution.
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