Keira Brooks

In the case above that you mention, `get_basis` is defined in the functions I copied above. I have noticed if that function exists outside of these functions, there is some...

I think I have identified at least part of the issue. In creating a simplified notebook I discovered that my results (while still different between `opd_expand_nonorthonormal` and `opd_expand_segments`) were different...

And here is [grab_opd_info.py](https://gist.github.com/kjbrooks/115921b6ed782b0b38a1332b119bd991) since that is necessary to run the notebook.

@aggle Did Marshall answer this issue for you, or did you have an error when running code? To expand on what Marshall said, the `JWpupil_segments` files are the JWST pupil...

That is a good point. However, isn't true that they only get converted to meters automatically if opened by `poppy`, not if you open them simply in with `astropy.io.fits`? I...