Step Arguments

The background image subtraction step has two optional arguments. They are used in the process of creating an average background image, to control the sigma clipping, and are passed as arguments to the astropy sigma_clip function:

--sigma

The number of standard deviations to use for the clipping limit. Defaults to 3.

--maxiters

The number of clipping iterations to perform, or None to clip until convergence is achieved. Defaults to None.