Parametres ==================
seisfile      =DATA/homo250c
recfile       =DATA/rec_ch
snapfile      =
Time ------------------------
nt            =1500
dt            =.5
Spher Coord -----------------
izfree        =6
iord          =1
nop           =2
aabsorb       =.000005
Nabsorb(0;00) =25
Dmax          =5000000.
Thetamax(deg) =80.
Model -----------------------
model_type    =3
vp0           =6000.
vs0           =4000.
rho0          =2000.
Source ----------------------
isx           =10
sdepth        =400000.
aa            =50.
it0           =10 
alpha         =0.
source_type   =2                         !1-f,2-M
Display ---------------------
idisp         =0
isnap         =100
icolor        =5
icomp         =2
Receivers------------------------------
xa            =10
xe            =200
irec          =10
izrec         =6
isamp         =1
Junk ------------------------------
ifork         =1
icheck        =10
icheckpoint   =1000
rmax          =6371000.
