Auto Bracketing on the XTi

I sometimes use the Auto Bracketing feature on my XTi, most of the time I set it to -2, 0, 2.
After this is set and I go back to the viewfinder, it shows three different pointers on the light meter.
If the middle one is slightly to the left of the center, meaning my normal exposure is underexposed, the pointer on the right is two stops to the right of that one.
But the left-most pointer is still only at -2 on the meter.
My question:
Does this mean that I'm only getting say a -2, -2/3, 1 1/3 bracket?
Or is this just a factor of the light meter not being able to show how far it really goes?

I hope you can understand my question.
I'm quite bad at getting my point across.

Take a set of bracketed pictures and then look at the EXIF data to see what the actual exposure data shows. On my XTi, it will show the bracketing symmetrically about whatever I have set as the nominal EC. For instance, I almost always shoot with EC set to +2/3. If I set bracketing to 2 EV above and below that, then the results are -1 1/3, 2/3, and 2 2/3 EV.

Also, the EV increments do not necessarily need to be uniform. That's the case with Photoshop ... your mileage may differ if using another program.