Surface brightness profiles in the r band of NGC 1052-DF4 (light blue) and NGC 1052-DF2 (orange) obtained from fixed ellipses with Gemini ultra-deep imaging. The shaded regions correspond to the error bars associated with the measurements. The two profiles are strikingly different. NGC 1052-DF4, which is clearly tidally disturbed, shows an excess of light (R > 40″) that is not seen in the case of NGC 1052-DF2.