Program sfftoper | First-arrival Traveltime Tomography (linear operator) 
[SYNOPSIS]
sfftoper < in.rsf > out.rsf time=time.rsf mask=mask.rsf adj=n
[PARAMETERS]
bool    | adj | =n |  [y/n] | 	adjoint flag 
string  | mask | = |   | 	auxiliary input file name
string  | time | = |   | 	auxiliary input file name
[DIRECTORY]
user/llisiw
