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Fig. 6.

Fig. 6. Refer to the following caption and surrounding text.

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Aperture photometry on the masked image in the r-band. The red ellipse corresponds to the 12″ (along the semi-major axis) aperture in which the magnitude was measured, while dashed white ellipses denote the annulus within which the background level was estimated at semi-major axes of 18″–24″.

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