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\n Synopsis
		sfztrace < in.rsf nt=nx*nz na=362 da=0.5 a0=-90. vel=y order=3 iorder=4

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\n Parameters
		\n \n \n \n   float a0=-90. \tstarting angle (in degrees) \n \n \n\n \n \n \n   float da=0.5 \tangle increment (in degrees) \n \n \n\n \n \n \n   int iorder=4 \tinterpolation accuracy for grid \n \n \n\n \n \n \n   int na=362 \tnumber of angles \n \n \n\n \n \n \n   int nt=nx*nz \tray length bound \n \n \n\n \n \n \n   int order=3 \tinterpolation accuracy for velocity \n \n \n\n \n \n \n   bool vel=y [y/n] \ty, input is velocity; n, slowness \n \n \n

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