Fig. 4
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PNe mimics. Left: 11.5 × 11.5 arcmin: Isolated HII region Fe 3 (SHS). Middle: 28.73 × 28.61 arcmin: Ionised ISM around hot star LDu 2. Image taken in France by Orange Observatory with a 0.4 m Newton telescope refractor (f/3.8), a cooled Moravian G4 CCD camera, a Paramount ME mount, and an Astrodon Hα filter. Exposure time: Hα 43 × 10 min. Exposure time total: 7.16 h (Nicolas Outters). Right: 3.22 × 3.21 arcmin: DeGaPe 33 emission-line star. Image taken in Chile by APO Team with 0.15 m refractor (f/7.3), a cooled Apogee ALTA U16M CCD camera, a mini-OHP MCMT mount, and Astrodon Hα, [OIII] and [SII] filters (APO Team).
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