Fig. D.1.

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MUSE reconstructed images (left panels) and stacked spectra (right panels) of the observed LEWIS targets. From the top to lower panels, UDG1, UDG3, and UDG4 are shown, respectively. The red line corresponds to the pPXF best fit using the setup described in Sect. 4. Grey boxes mark the masked regions, which are excluded from the fit.
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