
12/94
Added option for reading tabulated reflection coefficient.

 1/95
Added eigenray option which produces a ray plot but only
for those rays which connect the source and receiver(s).

 3/95
Sign changed on pressure field to make BELLHOP consistent
with the other models.

 9/97
Option to propagate time series directly in BELLHOP has
been removed and replaced with the option of writing
a arrivals file containing delays and amplitudes for each
arrival. Phase changes have been pulled from the delay
vector into a complex amplitude. Matlab script stackarr.m
written to stack up the arrivals taking into account all
phase changes.

11/97
The ray file is now written in ASCII rather than unformatted
binary. This makes it easier to for external programs to read ...

12/97
The option of including bottom bathymetry has been added.
