A good test of our sky-subtraction (and masking) algorithms is to generate curve-of-growth figures for each galaxy -- the cumulative flux (mag) vs radius or semi-major axis. If we're getting the sky right then the flux should asymptote to a ~constant.
A good test of our sky-subtraction (and masking) algorithms is to generate curve-of-growth figures for each galaxy -- the cumulative flux (mag) vs radius or semi-major axis. If we're getting the sky right then the flux should asymptote to a ~constant.
See, e.g., Fig B1 (middle) in Huang et al. 2017.