Parametres ==================
seisfile      =DATAVN/fdhomos
recfile       =DATAVN/receivers
snapfile      =
Time ------------------------
nt            =1600
dt            =.25
Spher Coord -----------------
izfree        =6
iord          =1
nop           =2
aabsorb       =.000005
Nabsorb(0;00) =50
Dmax          =3000000.
Thetamax(deg) =50.
Model -----------------------
model_type    =1
vp0           =10000.
vs0           =6000.
rho0          =5000.
Source ----------------------
isx           =10
sdepth        =0.
aa            =50.
it0           =10 
alpha         =150000.
source_type   =2                         !1-f,2-M
Display ---------------------
idisp         =0
isnap         =0
icolor        =5
icomp         =2
Receivers------------------------------
xa            =10
xe            =250
irec          =10
izrec         =6
isamp         =1
Junk ------------------------------
ifork         =1
icheck        =50
icheckpoint   =1000
rmax          =6371000.
