R help - Nov 2008 - coxph

Hello,

I ran the coxph model and everything worked fine. When I extract the
output from the basehaz(y) function and was wondering if that baseline
is cumulative or not.
I then do:

F(t,t+1)=1-exp(h_0(t+1) exp(coeff(1)*covariate(1)+...))

Does this give me the probability of death from t to t+1 (in which case
the baseline is not cumulative) or the probability of death before t+1
(in which case the baseline is cumulative)

Thanks so much for your help!
R