Program sftilrzone | Lowrank decomposition for 2-D anisotropic wave propagation using exact phase velocity (2 step time marching). 
[SYNOPSIS]
sftilrzone < c11.rsf fft=fft.rsf left=left.rsf > right.rsf mode=0 seed=time(NULL eps=1.e-4 npk=20 dt= approx=false
[PARAMETERS]
        | approx | =false |   | 	whether to use zone's approximation
        | dt | = |   | 	time step
        | eps | =1.e-4 |   | 	tolerance
file    | fft | = |   | 	auxiliary input file name
file    | left | = |   | 	auxiliary output file name
        | mode | =0 |   | 	wave mode (0=p wave, 1=Sv wave)
        | npk | =20 |   | 	maximum rank
        | seed | =time(NULL |   | 	
[DIRECTORY]
user/jsun
