Sigmoid - generate sigmoid reflectivity model

Sigmoid n1=400 n2=100 o1=0 d1=.004 o2=0 d2=.032 > synth.H

Sigmoid reflectivity model in 2-D: complex geological structure.

from par	integer	n1 =400, n2 =100	data size
	integer	large =5*n1	layering size
	real	o1 =0, d1 =0.004, o2 =0., d2 =0.032	grid spacing

Modules: random.f90 (for compatibility with Fortran-77)

See also: Make