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float a0=0. | First azimuth angle in degrees (if anglefile is not specified)
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float amax=360. | Maximum azimuth angle in degrees (if anglefile is not specified)
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string anglefile= | file with initial angles (auxiliary input file name)
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float b0=0. | First inclination angle in degrees (if anglefile is not specified)
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float bmax=180. | Maximum inclination angle in degrees (if anglefile is not specified)
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float dt= | Sampling in time
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bool escvar=n [y/n] | If y - output escape values, n - trajectories
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int na= | Number of azimuths (if anglefile is not specified)
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int nb= | Number of inclinations (if anglefile is not specified)
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int nt= | Number of time steps
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int order=4 | Interpolation order
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string shotfile= | file with shot locations (auxiliary input file name)
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bool sym=y [y/n] | if y, use symplectic integrator
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bool vel=y [y/n] | If y, input is velocity; if n, slowness
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float xshot=o[2] + 0.5*(n[2]-1)*d[2] | shot location crossline (if shotfile is not specified)
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float yshot=o[1] + 0.5*(n[1]-1)*d[1] | shot location inline (if shotfile is not specified)
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float zshot=o[0] | shot location in depth (if shotfile is not specified)
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