Synopsis
		sfexcitationic < Fv.rsf > Fout.rsf nb=20 nt= dt= fm=20.0 kt=300 jsx= jsz=0 jgx=1 jgz=0 sxbeg= szbeg= gxbeg= gzbeg= csdgather=y ns=1 ng=nx

Note that excitation imaging condition has some multipathing artifacts.
The significance of this imaging condition is the cheap computation and
low memory requirement. (1) Cheap computation: only 2 times of simulation,
one for source wavefield the other for receiver wavefield, are needed for
single shot imaging before stacking. (2) Low memory request: this imaging
condition only asks for the excitation time and the amplitude. Therefore,
it differs from cross-correlation imaging condition which needs storing
or reconstructing the source wavefield to cross-correlate with receiver
wavefield at each time step.

Parameters
		bool csdgather=y [y/n]   float dt= time sampling interval   float fm=20.0 dominant freq of Ricker wavelet   int gxbeg= x-begining index of receivers, starting from 0   int gzbeg= z-begining index of receivers, starting from 0   int jgx=1 receiver x-axis jump interval   int jgz=0 receiver z-axis jump interval   int jsx= source x-axis jump interval   int jsz=0 source z-axis jump interval   int kt=300 output wavefield at time kt   int nb=20 thickness of sponge ABC   int ng=nx number of receivers   int ns=1 number of shots   int nt= number of time steps   int sxbeg= x-begining index of sources, starting from 0   int szbeg= z-begining index of sources, starting from 0

Used In
		XJTU          test/excitationic