'P1 2-D model' 0 1 1 / (Cartesian coordinates, velocities, loss factors) 0. 47.3 -1. 1. 0. 6. / (boundaries of the model) 0 surfaces 1 simple block: / 1 complex block: 1 / 'END of input data for smooth surfaces' / 'COMPLEX BLOCK' 1 'VS ' -1 (S wave slowness interpolated) 1 3 0 0 -1 / (i.e. VS=W(X1,X3), tension=0, velocity given) 24 7 (numbers of gridpoints) 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 (X1) 0 1 2 3 4 5 6 (X3) 168*3 'END of complex blocks, end of the input data for the model' /