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sfgsray (4.0)		index
user/browaeys/Mgsray.c
\n Gauss Seidel iterative solver for phase space escape positions, angle and traveltime \n

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\n Synopsis
       sfgsray < in.rsf > out.rsf slow=slow.rsf slowz=slowz.rsf slowx=slowx.rsf dslow=dslow.rsf dtout=dtout.rsf iq= niter=50 liter=0 tol=0.000002*nx*nz order=1 verb=n sph=n
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\n Parameters
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string dslow= 		\tauxiliary input file name
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file dtout= 		\tauxiliary output file name
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int iq= 		\tswitch for escape variable 0=x, 1=a, 2=t, 3=z, 4=l, 5=i
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int liter=0 		\tnumber of first iterations with low-order scheme
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int niter=50 		\tnumber of Gauss-Seidel iterations
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int order=1 		\torder of upwind
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file slow= 		\tauxiliary input file name
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file slowx= 		\tauxiliary input file name
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file slowz= 		\tauxiliary input file name
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bool sph=n [y/n]		\ttrue - half-sphere, false - flat B.C. on left/right
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float tol=0.000002*nx*nz 		\taccuracy tolerance
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bool verb=n [y/n]		\tverbosity flag
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