SUMIGGBZO - MIGration via Gaussian Beams of Zero-Offset SU data

sumiggbzo <infile >outfile vfile= nz= [optional parameters]

Required Parameters:
vfile= name of file containing v(x,z)
nz= number of depth samples

Optional Parameters:
dt=from header time sampling interval
dx=from header(d2) or 1.0 spatial sampling interval
dz=1.0 depth sampling interval
fmin=0.025/dt minimum frequency
fmax=10*fmin maximum frequency
amin=-amax minimum emergence angle; must be > -90 degrees
amax=60 maximum emergence angle; must be < 90 degrees
bwh=0.5*vavg/fmin beam half-width; vavg denotes average velocity

Note: spatial units of v(x,z) must be the same as those on dx