Whats a ''Y length''?

[Superusuario]

Ok...I'm making a Zoom Tube and i don't know what is a Y length.

1. I used the Zoom Tube wizard.
2. I putted the Zoom Tube Start and End.
3. I get to the Zoom Tube speed thing and put like 60.
4. I put all the Zoom Tube Waypoints in the order.
5. I test it in SRB2 and i get stuck in the first Waypoint.

I watch This thing on the wiki And next i go to check This another thing on the Wiki and says:

X length = speed. Y length = waypoint sequence #.

So...What is that''Y length''?
Edit:Nevermind...I got my Zoom Tube to work.

 

[Donovan the hedgehog]

X could be left Y could be right and Z could be height

EDIT: I know that for things only

 

[xxBeanGirl420xx]

 

[Donovan the hedgehog]

?????????????????????????

 

[xxBeanGirl420xx]

Sigh.

In SRB2 DB or Wad Author:

On the coordinate plane:

X - Left/Right
Y - Up/Down
Z - Height