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\n Synopsis
		sfnmo3 < cmp.rsf > nmod.rsf velocity=vel.rsf offset=offset.rsf half=y eps=0.01 mute=12 extend=8

\ninput data has gathers along *4th* axis;
\nvelocity file contains slowness squared with n2=3 (wx,wy,wxy);
\noffset file contains x,y offset pairs for input data
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\n Parameters
		\n \n \n \n   float eps=0.01 \tstretch regularization \n \n \n\n \n \n \n   int extend=8 \ttrace extension \n \n \n\n \n \n \n   bool half=y [y/n] \tif y, the second and third axes are half-offset instead of full offset \n \n \n\n \n \n \n   int mute=12 \tmute zone \n \n \n\n \n \n \n   string offset= \tauxiliary input file name \n \n \n\n \n \n \n   file velocity= \tauxiliary input file name \n \n \n

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