Sure. I already check the results with the CI dataset and found they came out the same. Even going to far as to make sure the arrays in the input later functions were the same.

I'll show how much the memory usage is reduced by by checking the difference in how much is stored in the look up arrays in `self` before and after the change. Sound good?

Sounds perfect, thanks!

Ran through the HiTS and HSC dataset from the ap_verify ci datasets. For HiTS the static of memory stored in lookup tables. is reduced by a factor of ~2.5. For HSC the reduction is a factor of 2.375

Overall the memory stored in self of the class is reduced by a factor of ~2.5 when including all variables stored in the class's `self`.

Thanks for the numbers...an improvement, indeed.  I've left a few minor comments on the PR, but otherwise, LGTM.

Jenkins after review: https://ci.lsst.codes/blue/organizations/jenkins/stack-os-matrix/detail/stack-os-matrix/35117/pipeline