> I'm not certain this is an error, but should there not be a pad_factor here? Ah no, the RealGalaxy doesn't allow the user to specify that. Is this something we ought to add, alongside the kInterp?
> 
I was afraid that we were gtting into the realm of a ridiculous number of keywords.  But you're likely correct that for our accuracy tests, we will want to be able to specify both of these.  (Sigh.  No objection to doing the work, as it's minor, but the this constructor is getting cluttered, which isn't aesthetically pleasing.)