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float eps=0. | regularization parameter (for both Ticknov and Shaping)
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string grad= | auxiliary output file name
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string misnorm= | auxiliary output file name
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int niter=1 | number of slowness inversion iterations
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int nstep=10 | number of linesearch
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int order=2 | fast marching accuracy order
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float pow=2. | power raised for data weighting
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string prec= | auxiliary input file name
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string rayd= | auxiliary output file name
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string reco= | auxiliary input file name
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int rect#=(1,1,...) | smoothing radius on #-th axis
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string recv= | auxiliary input file name
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int seg=3 | maximum number of segments of topography
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bool shape=n [y/n] | regularization (default Tikhnov)
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string shot= | auxiliary input file name
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int stiter=100 | number of inner CG iterations (for both Ticknov and Shaping)
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string time= | auxiliary output file name
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float tol=1.e-6 | tolerance for shaping regularization
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string topo= | auxiliary input file name
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bool velocity=y [y/n] | if y, the input is velocity; n, slowness squared
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bool verb=n [y/n] | verbosity flag
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bool weight=n [y/n] | data weighting
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string what= | what to compute (default tomography)
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