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float air=0.5 | air velocity for thresholding topography
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float dp=1. | ray-parameter increment
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bool fix=n [y/n] | if y, fixed-spread; n, moving acquisition
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int np=1 | ray-parameter number
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int offset1=0 | receiver offset inline
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int offset2=0 | receiver offset crossline
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int order=2 | fast marching accuracy order
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float p0=0. | ray-parameter start
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bool plane=n [y/n] | if y, plane-wave source; n, point source
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file reco= | auxiliary output file name
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string shot= | auxiliary input file name
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string time= | auxiliary output file name
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string topo= | auxiliary output file name
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bool velocity=y [y/n] | if y, the input is velocity; n, slowness squared
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