I'm slowly getting there (I think!)
Conclusions/ Comments- For unsaturated star images, the maximum size of the star is similar to the Airy disk in diameter.
- The FWHM of the star image is reasonably constant.
- As the star image saturates, the “flat top” extends out to the diameter of the Airy disk.
- Also, for saturated star images the “wings” include additional energy from the outer rings, and can extend, in linear diameter, to and slightly beyond the dimensions of the 1st Airy ring.