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float eps=0. | regularization parameters
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string err= | output file for error
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bool hd=y [y/n] | if y, apply half-derivative filter
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int liter=5 | number of linear iterations
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int niter=5 | number of non-linear iterations, when niter=1, it's linear
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bool ps=y [y/n] | if y, apply pseudo-unitary weighting
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int sw=0 | if > 0, select a branch of the antialiasing operation
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file velocity= | auxiliary input file name
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bool verb=n [y/n] | verbosity flag
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