Fig. A.1.

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NGC1052-DF2 observational strategy. Top panel: NGC1052-DF2 field created from the SDSS r-band image. The image covers an area of 18′×18′. The five blue crosses indicate the representative centers of the dithering pattern surrounding the galaxy, while red crosses highlight the central positions of the sky frames. The dimensions of the GMOS CCDs are outlined in black around the galaxy, representing a total size for the camera of 5′×5′. The name of the bright star (mV = 8.34 mag) near NGC1052-DF2 is indicated by a label. Lower-left panel: Color composite image (using g and r filters) of NGC1052-DF2 obtained in this work with the Gemini telescope. Lower-right panel: Stack of sky images (g and r filters).
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