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float aper=SF_HUGE | Maximum aperture in x and y directions from current point (default - up to model boundaries)
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float df=0.25 | < Maximum distance to travel per step (fraction of the cell size) >
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float dt=0.001 | Time sampling
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float md=SF_HUGE | Maximum distance for a ray to travel (default - up to model boundaries)
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int na=360 | Number of phase angles
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int nc=0 | Number of threads to use for ray tracing (OMP_NUM_THREADS by default)
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int nt=1001 | Number of time samples for each trajectory
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bool parab=y [y/n] | y - use parabolic approximation of trajectories, n - straight line
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string traj= | Trajectory output (auxiliary output file name)
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bool verb=n [y/n] | verbosity flag
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string vspl= | Spline coefficients for velocity model (auxiliary input file name)
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