function out=dh(in)
global choice

if choice==1 | choice==2 | choice==3,
	out=2.*in.*exp(-in.^2/8);
elseif choice==4 | choice==5,
	out=2.*in.*exp(-in.^2/5)*1.5;
elseif choice==6 | choice==7,
	out=2.*in.*exp(-in.^2/3)*2;
elseif choice==8 | choice==9,
        out=2.*in.*exp(-in.^2)*4;
elseif choice==10 | choice==11,
	out=2.*in.*exp(-in.^2/5)*1.5;
else
	out=2.*in.*exp(-in.^2/4)*1.7;
end
