ObviousThr33s

Hey all, I've been doing some LOD generation recently and I was wondering if anyone could enlighten me on what the CMD output for object generation means. An example of what I mean is, "Finished LOD level x coord [x, y] [??/??]". What are those last two numbers in the output? I've looked around but I couldn't find an answer easily. So if anyone has any idea please let me know. Thanks!