I assume the lattices were not generated from a chain model (if they
were, the acoustic scale is very wrong).
The confidences won't always be very good, they are just derived from
the lattice posterior. They will be particularly poor if the language
model doesn't contain a lot of short words (which could act as a kind
of filler model).
Yes, the last field is the confidence; the fields in red are "channel"
(normally 1, 2, A or B), start-time, duration.
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