Activity of 41P vs. solar distance. The plot shows the afρ parameter of the comet estimated from the SDSS r filter images through a 5000 km aperture. Different phase-correction models, represented by different colors, symbols, and offsets in log afρ, were applied to this data set: Rosetta (Moreno et al. (2018); filled magenta squares, offset +2.75); linear phase angle correction (filled red dots, offset +2.25); Bowell A (Bowell et al. (1989); open blue dots, offset +1.25); Bowell B (Bowell et al. (1989); open blue triangles, offset +1.0); Schleicher 2010 (Schleicher (2010); open black diamonds, offset +0.0); Mueller (Müller (1999); open red squares, offset +0.25); Schleicher 1998 (Schleicher et al. (1998); filled black diamonds, offset −0.75). The colored lines show the corresponding fits for the cometary activity. Corrections for flux contributions from coma gas and from the nucleus are also applied.