Hi, I have a question concerning female body proportion. I have a diagram, that I'm looking at, and I need some help figuring it out.

Here it is: http://fineart.sk/show.php?w=902 (It's the Andrew Loomis Diagram Quick-Setup of proportions.)

On the female diagram, does he split the top and bottom in half, then divide the bottom in half, and then divide the top portion into thirds? I measured it, but it seemed kinda off. Thanks for the help.