'lenb-ini.dat - plane wave incident at the model bottom at 45 degrees:' 4 (Number MFUNC of functions specified) 'X1-COORDINATE' 1 1 0 0 0 / (X1-coordinate is a function of ray parameter G1) 2 (Number of grid points) 0 60 (G1 grid coordinates) 0 60 (X1-coordinate coincides with ray parameter G1) 'X2-COORDINATE' 2 2 0 0 0 / (X2-coordinate is a function of ray parameter G2) 2 (Number of grid points) -20 20 (G2 grid coordinates) -20 20 (X2-coordinate coincides with ray parameter G2) 'X3-COORDINATE' 3 0 0 0 0 / (X3-coordinate=constant, tension=0) -25 (Bottom of the model) 'TRAVEL TIME' 4 1 0 0 0 / (Initial time is function of ray parameter G1) 2 (No. of grid points: linear function = plane wave) 0 60 (G1 grid coordinates) 0 6.060915 (Angle of incidence is 45 degrees) 'END OF DATA FOR THE INITIAL SURFACE' / 'lenb-rpa.dat: Ray parameters for initial surface' 2 -1 -2 0.001 0.003750 / (ISRFR,ISRFX1,ISRFX2,XERR,AERR) 0. -20. 60. -20. 0. 20. 45 30 1 / / ------------------------------------------------------------------------ The model with a homogeneous lenticular inclusion in a constant velocity gradient layer is described by the demo data file 'len-mod.dat' of package 'MODEL'. The same receivers 'len-rec.dat', numerical ray tracing parameters 'len-crt.dat' and output file names (see 'writ.dat') as for the point source are used. Data set 'lenb-ini.dat' specifies a plane wave incident at the bottom of the model (X3=-25). The plane of incidence is parallel to the X1X3 plane, the angle of incidence is 45 degrees. The initial travel time is 0 along the left-hand bottom edge of the model (X1=0, X3=-25). Horizontal slowness component is thus SIN(45deg)/V=SQRT(2)/7=0.10101525. The ray parameters G1,G2 are chosen to coincide with Cartesian coordinates X1,X2. Data set 'lenb-rpa.dat' specifies the parameters for shooting the rays from the initial surface (bottom of the model in this case). The ray parameters G1,G2 are assumed to coincide with Cartesian coordinates X1,X2. The maximum distance of the two-point ray from the receiver, measured in the coordinates along the reference surface, is 0.001 km. The maximum error in determining the boundary between ray histories, measured in the ray parameters along the initial surface, is 0.005 km. ========================================================================