Step ArgumentsΒΆ

The background image subtraction step has two optional arguments, both of which are used only when the step is applied to non-WFSS exposures. 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.