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sfcell2 (4.0)		index
system/seismic/Mcell2.c
\n Second-order cell ray tracing with locally parabolic rays.\n

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\n Synopsis
       sfcell2 < vel.rsf > time.rsf shotfile=shots.rsf anglefile=angles.rsf vel=y order=4 lsint=n nt=nx*nz nr= a0=0. amax=360. traj= > rays.rsf
Rays and wavefronts can be displayed with sfplotrays.
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\n Parameters
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float a0=0. 		\tFirst angle in degrees (if anglefile is not specified)
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float amax=360. 		\tMaximum angle in degrees (if anglefile is not specified)
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string anglefile= 		\tfile with initial angles (auxiliary input file name)
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bool lsint=n [y/n]		\tif use least-squares interpolation
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int nr= 		\tNumber of angles (if anglefile is not specified)
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int nt=nx*nz 		\tnumber of time steps
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int order=4 		\tInterpolation accuracy
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string shotfile= 		\tfile with shot locations (auxiliary input file name)
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string traj= 		\t
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bool vel=y [y/n]		\tIf y, the input is velocity; if n, slowness
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