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\n Synopsis
		sfdsrtomo0 < in.rsf > out.rsf reco=reco.rsf mask=mask.rsf prec=prec.rsf grad=grad.rsf velocity=y limit=n shape=n verb=n niter=5 cgiter=10 thres=5.e-5 tol=1.e-3 nloop=10 eps=0. causal=y rect#=(1,1,...)

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\n Parameters
		\n \n \n \n   bool causal=y [y/n] \tif y, neglect non-causal branches of DSR \n \n \n\n \n \n \n   int cgiter=10 \tnumber of conjugate-gradient iterations \n \n \n\n \n \n \n   float eps=0. \tregularization parameter \n \n \n\n \n \n \n   string grad= \tauxiliary output file name \n \n \n\n \n \n \n   bool limit=n [y/n] \tif y, limit computation within receiver coverage \n \n \n\n \n \n \n   string mask= \tauxiliary input file name \n \n \n\n \n \n \n   int niter=5 \tnumber of inversion iterations \n \n \n\n \n \n \n   int nloop=10 \tnumber of bisection root-search \n \n \n\n \n \n \n   string prec= \tauxiliary input file name \n \n \n\n \n \n \n   string reco= \tauxiliary input file name \n \n \n\n \n \n \n   int rect#=(1,1,...) \tsmoothing radius on #-th axis \n \n \n\n \n \n \n   bool shape=n [y/n] \tshaping regularization (default no) \n \n \n\n \n \n \n   float thres=5.e-5 \tthreshold (percentage) \n \n \n\n \n \n \n   float tol=1.e-3 \ttolerance for bisection root-search \n \n \n\n \n \n \n   bool velocity=y [y/n] \tif y, the input is velocity; n, slowness-squared \n \n \n\n \n \n \n   bool verb=n [y/n] \tverbosity flag \n \n \n

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