@tomaszkacprzak are these lines are repreated every other line?

If so, could they not be ommitted and we would almost halve the size of this merge from ~6000 lines to ~3000 lines?  I think that's worth doing: we have to consider the size of the repository and not wantonly add lines of code.

In fact Mike has just the comment https://github.com/GalSim-developers/GalSim/pull/458/files#r6950387 that we should omit these catalogs  altogether if they are simply code output.  I agree: information about reproducing them is all that is required.