Similar to Fig. A.1, but for NGC1052-DF4. Upper panel: NGC1052-DF4 field over an area of 18′×18′ using data from the SDSS r band. The dimension of the GMOS camera and the centers of the dithering pattern around the galaxy and for the sky images are highlighted. Lower-left panel: Final stack of the galaxy in black and white background, using the GMOS r filter. The color part of the Gemini stamp is created using rescaled HiPERCAM data from Montes et al. (2020) using the g, r, and z filters. Lower-right panel: Sky region that was observed to obtain the flat field of the data.