function [ ah, bh, ch ] = BNDRY_H(t,x,y,u)
% 
% Written by:
% -- 
% John L. Weatherwax                2006-03-12
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

ah = 1.0;
bh = 0.0; 
ch = 0.0;