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Fig. 13

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Histogram of the ellipticities of the sources (ϵ), defined as the relative discrepancy between the maximum and the minimum axes (i.e., the two FWHMs) of the fitted ellipse. Ellipticity ϵ = 0 means perfectly circular source, whereas large ϵ indicate highly elongated ones. The vertical dashed black line marks the median value ϵ = 1.25.

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