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Fig. 2

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Fringe pattern for nine different PID 3779 pointings around a single dither position in band 1A (top) and 4B (bottom), for one pixel to the left of the PSF peak (left), the central pixel of the PSF (centre), and one pixel to the right of the peak (right). The coloured lines show the pattern from 10 Lac, while the black dotted line shows the extended fringe flat from the current pipeline (Crouzet et al. 2025). The vertical black line highlights where a fringe peak occurs in the extended fringe flat. The Δα values indicate the offset in α coordinate from the central pointing (Δ α = 0). For reference, the pixel size in channels 1 and 2 is 196 mas, and 245 and 273 mas in channels 3 and 4, respectively (Wells et al. 2015).

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