sfdsrtomo0 (2.0-git)
Prestack first-arrival traveltime tomography (DSR)

        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,...)

bool causal=y [y/n]
if y, neglect non-causal branches of DSR
int cgiter=10
number of conjugate-gradient iterations
float eps=0.
regularization parameter
string grad=
auxiliary output file name
bool limit=n [y/n]
if y, limit computation within receiver coverage
string mask=
auxiliary input file name
int niter=5
number of inversion iterations
int nloop=10
number of bisection root-search
string prec=
auxiliary input file name
string reco=
auxiliary input file name
int rect#=(1,1,...)
smoothing radius on #-th axis
bool shape=n [y/n]
shaping regularization (default no)
float thres=5.e-5
threshold (percentage)
float tol=1.e-3
tolerance for bisection root-search
bool velocity=y [y/n]
if y, the input is velocity; n, slowness-squared
bool verb=n [y/n]
verbosity flag