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float a0=0. | minimum angle (if no anglefile)
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float amax=360. | maximum angle (if no anglefile)
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string anglefile= | file with initial angles (auxiliary input file name)
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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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string eta= | eta parameter
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int nr= | number of angles (if no anglefile)
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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 vel=y [y/n] | If y, input is velocity; if n, slowness
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bool verb=y [y/n] | Verbosity flag
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string vx= | horizontal velocity or slowness
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float yshot=o[1] + 0.5*(n[1]-1)*d[1] |
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float zshot=0. | shot coordinates (if no shotfile)
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