Program sfdiffraction | Generate diffractions in zero-offset data. 
[SYNOPSIS]
sfdiffraction < w1.rsf w2=w2.rsf w12=w12.rsf spikes=spikes.rsf > data.rsf freq=0.2/dt
[PARAMETERS]
float   | freq | =0.2/dt |   | 	peak frequency for Ricker wavelet 
file    | spikes | = |   | 	auxiliary input file name
file    | w12 | = |   | 	auxiliary input file name
file    | w2 | = |   | 	auxiliary input file name
[DIRECTORY]
system/seismic
