The wfs_combine step has one step-specific argument:
--do_refine boolean default=False
If set to True, the nominal image offsets computed from the WCS information are
refined using image cross-correlation. See the algorithm description section for details.
--flip_dithers boolean default=True
When set to True the output star in the combined image from the pairs of WFS images will always be at the same pixel location.
--psf_size float default=100
The largest PSF size in pixels to use for the alignment. This is only used when do_refine==True.
--blur_size flost default=10
The smoothing that is applied for the initial centroiding. his is only used when do_refine==True.
--n_size int default=2
This controls the size of the box used to interpolate in the input images. Should never need to be changed.