some questions about stress

[bringtree]

./t2p covina
pau k ow v iy1 n ax pau

cmudict-0.4.out
covina nil k ow0 v iy1 n ax0

Hello, I meet some questions about the accent.
In the training data, there are ow0, ax0. there is not ow.
But when I use ./t2p to predict the words. I found the t2p print ow (not ow0)!
Could you help me? I want to know the detail about how the flite deals with the accent?
Thanks.

[lenzo-ka]

ow0 is equivalent to ow. The 1 is the marker for stress.