Program sffermatrecursion | 2D traveltime derivatives computation with the recursion from Fermat's principle (Sripanich and Fomel, 2017)
[SYNOPSIS]
sffermatrecursion < refl.rsf slow=slow.rsf vnmosq=vnmo.rsf t0sum=t0.rsf dip=dipf.rsf curv=curvf.rsf > vnmohet.rsf dipcurv=n order=3
[PARAMETERS]
file    | curv | = |   | 	auxiliary input file name
file    | dip | = |   | 	auxiliary input file name
bool    | dipcurv | =n |  [y/n] | 	if get dip/curvature from separate files 
int     | order | =3 |   | 	Interpolation order
file    | slow | = |   | 	auxiliary input file name
file    | t0sum | = |   | 	auxiliary input file name
file    | vnmosq | = |   | 	auxiliary input file name
[DIRECTORY]
user/zone
