Fig. A.1.

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Top panels: Zoom-in on the MUSE color-composite image of UG103 highlighting the elongated background source, enclosed by the dashed white ellipse. The middle and right panels show flux maps integrated around each Hα + [N II] complex. Physical scale bars are adapted according to the redshifts of the main and background galaxies. Bottom panel: MUSE spectra integrated within the dashed white ellipse, zoomed in both Hα + [N II] complexes. Shadowed regions indicate the wavelength ranges used to produce the middle and right images.
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