Program sffftfwi_sparse_2d | 2D frequency domain full waveform inversion with sparsity regularization. 
[SYNOPSIS]
sffftfwi_sparse_2d < in.rsf > out.rsf receiver=receiver.rsf source=source.rsf record=record.rsf dip=dip.rsf vout=vout.rsf misfit=misfit.rsf sparsity=y niter=10 npml=20 par=1 pclip=8. uts=0 order= type=
[PARAMETERS]
string  | dip | = |   | 	auxiliary input file name
string  | misfit | = |   | 	auxiliary output file name
int     | niter | =10 |   | 	number of iteration 
int     | npml | =20 |   | 	PML width 
string  | order | = |   | 	discretization scheme (default optimal 9-point) 
int     | par | =1 |   | 	seislet transform accuracy order 
float   | pclip | =8. |   | 	soft thresholding parameter 
string  | receiver | = |   | 	auxiliary input file name
string  | record | = |   | 	auxiliary input file name
string  | source | = |   | 	auxiliary input file name
bool    | sparsity | =y |  [y/n] | 	if true, sparsity constriant; if false, normal FWI 
string  | type | = |   | 	[haar,linear,biorthogonal] wavelet type, the default is biorthogonal 
int     | uts | =0 |   | 	
string  | vout | = |   | 	auxiliary output file name
[DIRECTORY]
user/zhiguang
