Left: BPT diagram of HII regions selected by visual inspection of the [OIII]λ5007 map. Right: the collapsed median cube smoothed 10 × 10 pixels with circles indicate the position of the selected HII regions. HII regions that are part of the main body of galaxies are circled in magenta, while HII regions outside the bright disk of the galaxy are circled in blue (v − vsys< 100 km s-1) and red (v − vsys> 100 km s-1). We note that by this division, HII regions that lie outside the galaxy are neatly distributed along two separate trails.
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