BxA meaning on T&S window

[keen246 7]

I'm trying to figure out what is the meaning of the "BxA" column on the T&S DAS trader window. I inquired to DAS support but they replied a foolish simplistic answer saying "it's the bid and the Ask". That shows they don't even know themselves.

I also spent quite a few hours googling, but the few matches the search yields, it's just not clear and conflicting. 

So I wonder if any of the members have already figured out the REAL meaning of the "BxA" column and what it might mean at any given price. I somehow have the feeling that it might provide useful information to some of us that try to confirm our entries using the T&S.

I leave the topic open so hopefully there can be a discussion on the matter and those interested can benefit from it.