rbg/rwg vs. bgr/wgr

The DirectRt manual in my edition (2008.1) refers to RBG and RWG for Randomization Between Groups and Randomization Within Groups, respectively, and shows those columns as titled with "rbg" and "rwg" in the illustrations. But when I create a new input file (File > New Input File), those columns get titles "bgr" and "wgr" instead. It seems to work either way, but I find the inconsistent terminology a bit jarring (and I am not the first to note this, see [URL]http://www.empirisoft.com/Support/showthread.php?t=869[/URL]). So what's up with that?

Thanks,
-- David McFarlane, Professional Faultfinder