'lenz-ini.dat - exploding reflector:' 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 1 -3 0 0 / (I.e. X3=W(G1), tension=0) 5 (Numbers of grid points) 0 10 25 40 60 (G1 grid coordinates) -16 -17 -20 -17 -15 (X3 coordinates at grid points - model surface 4) 'TRAVEL TIME' 4 0 0 0 0 / (Constant initial time) 0 (Initial time = 0) 'END OF DATA FOR THE INITIAL SURFACE' / 'lenz-rpa.dat: Ray parameters for initial surface' 2 -1 -2 0.001 0.002500 / (ISRFR,ISRFX1,ISRFX2,XERR,AERR) 0. -20. 60. -20. 0. 20. 15 10 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 'lenz-ini.dat' specifies model surface 4 as an exploding reflector. The initial travel time is 0 along the reflector. The ray parameters G1,G2 are chosen to coincide with Cartesian coordinates X1,X2. Data set 'lenz-rpa.dat' specifies the parameters for shooting the rays from the initial surface (exploding reflector 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 0.010 km. ========================================================================