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\n Synopsis
		sftkirinv < in.rsf vel=vel.rsf > out.rsf offset=offset.rsf fdip=fdip.rsf ompchunk=1 ompnth=0 verb=n half=y amp=y ncdp=ncmp dcdp=dcmp cdp0=cmp0 reg=0 antialias=1.0 apt=ncmp rho=1.-1./nt niter=5 nw=3 err=

regularization (or preconditioning) operator:
\nreg=0: no regularization;
\nreg=1: regularization => first derivative along offset axis;
\nreg=2: precondition => causual integration along offset axis;
\nreg=3: precondition => triangle smoother along offset axis,
\nreg=4: precondition => local slope constraints along t-x plane and smoothing along offset axis
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\n Parameters
		\n \n \n \n   bool amp=y [y/n] \tif y, use amplitue factor \n \n \n\n \n \n \n   float antialias=1.0 \tantialiasing \n \n \n\n \n \n \n   float apt=ncmp \tmigration aperture \n \n \n\n \n \n \n   float cdp0=cmp0 \t \n \n \n\n \n \n \n   float dcdp=dcmp \t \n \n \n\n \n \n \n   string err= \toutput file for error \n \n \n\n \n \n \n   string fdip= \tauxiliary input file name \n \n \n\n \n \n \n   bool half=y [y/n] \tif y, the third axis is half-offset instead of full offset \n \n \n\n \n \n \n   int ncdp=ncmp \t \n \n \n\n \n \n \n   int niter=5 \tnumber of iterations \n \n \n\n \n \n \n   int nw=3 \t \n \n \n\n \n \n \n   string offset= \tauxiliary input file name \n \n \n\n \n \n \n   int ompchunk=1 \tOpenMP data chunk size \n \n \n\n \n \n \n   int ompnth=0 \tOpenMP available threads \n \n \n\n \n \n \n   int reg=0 \tregularization type \n \n \n\n \n \n \n   float rho=1.-1./nt \tLeaky integration constant \n \n \n\n \n \n \n   file vel= \tauxiliary input file name \n \n \n\n \n \n \n   bool verb=n [y/n] \tverbosity flag \n \n \n

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