Evaluating the coma of 2020 MK₄. Normalized radial profile of the combined images of 2020 MK₄ obtained on July 17 minus a star profile of a different brightness (the assumed nucleus) together with the normalized radial profile of an isotropic coma (thick, black curve, see text). Upper-left panel: the profile of the comet. Upper-right panel: the profile of the comet minus that of a nucleus (a star) of r′ = 20.73 mag. Bottom-left panel: the profile of the comet minus that of a nucleus of r′ = 19.73 mag. Bottom-right panel: the profile of the comet minus that of a nucleus of r′ = 19.53 mag. It is important to notice that the coma that remains once a nucleus of r′ = 19.53 mag has been subtracted resembles what an isotropic coma should look like.