Fig. 7
4′ × 4′ NGC 7507 colour map. North is up, east to the left. The colour palette represents the range 1.85 < (C − T1) < 2.2 from blue to red (beyond a radius of about 1′ the colours are no longer reliable). We interpret the redder parts (indicated with blue and green colours) as being caused by dust, which has been detected before (Temi et al. 2004).
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