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int extend=4 | trace extension
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float h0=0. | reference offset
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bool half=y [y/n] | if y, the second axis is half-offset instead of full offset
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string mask= | auxiliary input file name
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string offset= | auxiliary input file name
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string s= | auxiliary input file name
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bool slowness=n [y/n] | if y, use slowness instead of velocity
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bool squared=n [y/n] | if y, the slowness or velocity is squared
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float str=0.5 | maximum stretch allowed
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file velocity= | auxiliary input file name
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