The wavenumber sampling block is of the standard SAFARI/OASES format. The phase velocities control the wavenumber interval included in the computation of both scattering kernels (options I,S,c), and the reverberant field (options C,D,R,a,r). The sampling data NW,IC1,IC2 are only used for kernel computations. For computation of reverberation (options C,D,R,a,r) the sampling, including the complex offset, is automatically chosen to be identical to the one used for the mean field in OAST.