I looked at it and still is somewhat confused.

I'm interested in cell basis vectors for truncated octahedron.

it seems like they are defined as follows (if I understood the meaning of XTLABC array correctly)

A = (a, -a/5, -a/5)

B = (-a/5, a, -a/5)

C = (-a/5, -a/5, a)

these vectors do have correct angles between them, but at the same time they are not of appropriate length. I mean, aren't cell basis vectors supposed to be of length a?

If anyone can clarify this matter I'd greatly appreciate it.