Fig. B.4.

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Surface brightness profile of NGC1052-DF4 with different telescopes: IAC80 (Montes et al. 2020), DECaLS (this work), Dragonfly (Keim et al. 2022), and Gemini (this work). In all cases the ellipticity and PA are allowed to vary freely. We also include the Gemini profile (green dots) resulting from fixing the ellipticity and PA (see the main text for details). The IAC80 data correspond to images where the g-, r-, and i-band filters have been combined, and for Dragonfly the g and r bands have been combined, while in the case of DECaLS and Gemini we show only the r-band results. The IAC80 and Dragonfly profiles have been shifted vertically by 0.1 mag and 0.25 mag, respectively, to match the r-band profiles only, to facilitate comparison between different telescopes.
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