Fig. C.1.
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Surface brightness profiles of the continuum (blue dots) and [NII] emission line (red line). The black crosses correspond to the location where we measured the projected radius of the ionized gas and the continuum roughly at ∼ 10−17 erg s−1 cm−2 arcsec−2. No optical emitting gas is found at ∼ 10−17 erg s−1 cm−2 arcsec−2 for NGC 4169 and NGC 4261.
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