Fig. 2.
Left: pseudo-colour image of IC 3476 obtained combining the NGVS (Ferrarese et al. 2012) optical u and g in the blue channel, the r and NB in the green, and the i and the continuum-subtracted Hα in the red. Right: same figure produced using a Hα continuum-subtracted frame smoothed to an angular resolution of 2.8″ to highlight low surface brightness features. The diffuse ionised gas is shown by the coherent emission seen in the red channel on the western side of the galaxy, while the granularity in the eastern side is noise.
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