Parametres ==================
seisfile      =DATAV1/fd_vp1
recfile       =DATAV/receivers
snapfile      =
Time ------------------------
nt            =1600
dt            =.25
Spher Coord -----------------
izfree        =6
iord          =1
nop           =2
aabsorb       =.000005
Nabsorb(0;00) =50
Dmax          =2871000.
Thetamax(deg) =50.
Model -----------------------
model_type    =4
vp0           =13163.
vs0           =0.
rho0          =5000.
Source ----------------------
isx           =10
sdepth        =600000.
aa            =0.
it0           =10 
alpha         =75000.
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.
