4           ! tt_sam   = resampling rate for traveltime map
75.0        ! ap       = aperture of amplitude calculation kirchhoff
0           ! impulse  = 1, impulse response; else, gaussian source
0           ! amp_op   = flag for forward amp option (=1, constant vel)
0           ! lineprint= test line-print (=1,2,3, print tt & amp)
960.0       ! printdepth= the print depth
