The assign_wcs step has the following optional arguments to control
the behavior of the processing.
--sip_approx(boolean, default=True)- A flag to enable the computation of a SIP approximation for imaging modes.
--sip_degree(integer, max=6, default=None)- Polynomial degree for the forward SIP fit. "None" uses the best fit.
--sip_max_pix_error(float, default=0.01)- Maximum error for the SIP forward fit, in units of pixels. Ignored if
sip_degreeis set to an explicit value. --sip_inv_degree(integer, max=6, default=None)- Polynomial degree for the inverse SIP fit. "None" uses the best fit.
--sip_max_inv_pix_error(float, default=0.01)- Maximum error for the SIP inverse fit, in units of pixels. Ignored if
sip_inv_degreeis set to an explicit value. --sip_npoints(integer, default=12)- Number of points for the SIP fit.
--slit_y_low(float, default=-0.55)- Lower edge of a NIRSpec slit.
--slit_y_high(float, default=0.55)- Upper edge of a NIRSpec slit.