The second issue windowing is time gating. In fact, when people want to window data, they often want to do both trace and time gating.
Options for vertical windowing (time gating):
tmin = 0.0 min time to pass
tmax = (from header) max time to pass
itmin = 0 min time sample to pass
itmax = (from header) max time sample to pass
nt = itmax-itmin+1 number of time samples to pass
The result of setting either ``itmin and itmax'' or ``tmin
and tmax'' will be to create a time gate which is to the
nearest sample. If you want to time gate to an arbitrary
(inter-sample) window, then this is a problem in data resampling
and ``suresamp'' is the program of choice.