Disregard the measurements...this is how the two types of alignment look.
In some cases, the 1/3 third co-witness will actually align the red dot with the sights, since the dot "should" be lined up on target no matter where you put your eye, up to a certain limit.

In some cases, the 1/3 third co-witness will actually align the red dot with the sights, since the dot "should" be lined up on target no matter where you put your eye, up to a certain limit.
