Brent Belland please consult the new version of the algorithm at github (https://github.com/Subaru-PFS/dev_2ddrp/tree/master/2d_PSF_code). The parameters, if you are using Zernike up to 22 are:

'z4', 'z5', 'z6', 'z7', 'z8', 'z9', 'z10', 'z11', 'z12', 'z13', 'z14', 'z15', 'z16', 'z17', 'z18', 'z19', 'z20', 'z21', 'z22', 'hscFrac', 'strutFrac', 'dxFocal', 'dyFocal', 'slitFrac', 'slitFrac_dy', 'wide_0', 'wide_23', 'wide_43', 'misalign', 'x_fiber', 'y_fiber', 'effective_radius_illumination', 'frd_sigma', 'frd_lorentz_factor', 'det_vert', 'slitHolder_frac_dx', 'grating_lines', 'scattering_slope', 'scattering_amplitude', 'pixel_effect', 'fiber_r', 'flux'

Note the new parameters wide_0, wide_23, wide_43 and misalign. You can use old parameters, but set wide_0, wide_23 and wide_43 to 0. Misalign is the parameters that control amount of misalignment (as shown in the Figure). Perhaps it would be beneficial if you would switch to using updated parameters for psf solutions which would be more accurate and which were done with these parameters choices. Let's talk about this tomorrow. If you are eager to start working on that before our normal meeting time at 4.30pm at East Coast, send me a msg on Slack. 

I will keep this open for a moment until we assure that complete transfer of information between Brent and I has been achived.