I understood what these couple of lines meant after a couple of passes.  I think the line
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- This also lets us include the pixel response in our PSF image already.
```
might be a little clearer/fuller if it were
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- This SDSS PSF image already includes the effect of integrating across a square pixel, so by treating the image as being at 0.2" resolution we remove the need to apply any additional galsim.Pixel convolution (or deconvolution, which is problematic as the Pixel FT crosses zero periodically).
```
Or do you think that is overkill?