Qφ images binned by 10 pixels along the x-axis and by 2 pixels along the y-axis and smoothed via a Gaussian kernel with σ = 1 pixel (panel a) and with σ = 2 pixels (panel b) to highlight the structure and position of both rings relative to each other. The central part of the images, dominated by strong residuals, is masked out. The position of the star is indicated by a yellow asterisk. The x-axis (interrupted white line going through the star position) shows the outer disc major axis at PA = 279.0°. The FOV of the displayed panel a is 9.8′′× 0.74′′. The letters “A”, “B”, “C” and “D” are used to label the surface brightness peaks discussed in Sect. 4.1. Colour bar shows flux in counts per binned pixel.
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