Synopsis
		sfpde2dadp < in.rsf > out.rsf slow=slow.rsf slowz=slowz.rsf slowx=slowx.rsf iq= method= method_2d= niter=100 ixsmooth= izsmooth= xsmooth= zsmooth= is_xinf= is_zinf= tol=0.000002*nx*nz cvgce=

Parameters
		string cvgce= output file for convergence   int iq= switch for escape variable 0=x, 1=a, 2=t, 3=z   int is_xinf=   int is_zinf=   int ixsmooth=   int izsmooth=   int method=   int method_2d=   int niter=100 number of Gauss-Seidel iterations   file slow= auxiliary input file name   file slowx= auxiliary input file name   file slowz= auxiliary input file name   float tol=0.000002*nx*nz accuracy tolerance   float xsmooth=   float zsmooth=