.de BR
.in 0
.in +8n
.ti -5n
..


.Th TRAPEZOID
.S2 SUMMARY:
Convolve with unit area trapezoid

TRAPEZOID Width L1 L2 L3
.S2 INPUT:
Width L1 L2 L3 :  L1, L2 and L3 define the trapezoidal pulse. These values are adjusted to lie on a sample with.
.S2 DESCRIPTION:
Convolve the time series in memory with a unit area trapezoidal pulse.
.sp
This acts as a lowpass filter.
.sp
If L1 + L2 + L2 < 2*DELTA, nothing is done
.S2 EXAMPLES:

.S2 "SEE ALSO":
TRIANGLE, BOXCAR, RICKER
