5′ × 5′ archival image taken in 1980 from the SERCJ survey, with the SPOC photometric aperture overplotted in blue (TESS pixel size is 21′′), and the positions of Gaia DR2 sources (J2015.5) within 2′ of HD 219666 indicated by circles. HD 219666 is in red, nearby sources contributing more than 1% of their flux to the aperture arein orange (see Sect. 2.2), and other sources are in green.
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