Quote - Man all the Xs Ys and math symbols sure are daunting (in those scripts)  I just see them and my soul starts to hurt.  I hope I get the hang too = )

The Ys just mean up and down and the Xs mean side to side. (Zs mean back and forth).
So when you see the Y, just think how high, an when you see the X just think extent.
(And the Z, how near me.)