Hi Joe,

If you run 3dWarp to transform a dataset (such as you did with
your anatomical), then afterwards it should be listed as plumb.

The definition of being oblique is that the dataset axes do
not match the cardinal axes, they are rotated to some degree.
The 3dWarp program applies the oblique transformation, and
stores the result on a cardinal axis grid (requiring a resampling
of the data - the penalty of acquiring oblique data (though we
generally don't care about doing this to the anatomy)).

Note that if you want to apply the oblique transformation to the
EPI data, as is more precise, it should be a worry to apply an
extra resample step. However, once Daniel distributes his new
program, we will be able to offer something that applies that
at the volume registration step, so there is little penalty.

- rick