Program sfmpictshiftlr | Correct time-shift gathers with two-step lowrank propagator 
[SYNOPSIS]
sfmpictshiftlr left=left.rsf right=right.rsf dt=0.001 nb=60 par=0.01 cmplx=n abc=y pad1=1 taper=y thresh=0.92
[PARAMETERS]
bool    | abc | =y |  [y/n] | 	absorbing boundary condition 
bool    | cmplx | =n |  [y/n] | 	use complex FFT 
float   | dt | =0.001 |   | 	time interval 
file    | left | = |   | 	auxiliary input file name
int     | nb | =60 |   | 	boundary width 
int     | pad1 | =1 |   | 	padding factor on the first axis 
float   | par | =0.01 |   | 	absorbing boundary coefficient 
file    | right | = |   | 	auxiliary input file name
bool    | taper | =y |  [y/n] | 	tapering 
float   | thresh | =0.92 |   | 	thresholding 
[DIRECTORY]
user/zhiguang
