This is going to take a while to work out, I think, and probably I will wind up making pdf files. But I don’t know how to figure out what to do except by trying, so here’s a first attempt.
Those of you who don’t know what TGU refers to, or what I’m doing here, be patient. I’ll put in the explanations once I know what I’m doing with the graphics. You can find the proper references if you search for “the guys upstairs.”