how to plot ternary with data base on their probability?

I want to have a ternary plot same as this

i wrote this but it is not like as the above

[h,hg,htick]=terplot;

%-- Plot the data ...

hter1=ternplot(BBr(1:125), FFe(1:125), CCa(1:125));

hold on

hter2=ternplot(BBr(126:859), FFe(126:859), CCa(126:859));

%-- ... and modify the symbol:

set(hter1,'marker','o','markerfacecolor','red','markersize',6)

set(hter2,'marker','+','markerfacecolor','blue','markersize',6)

hlabels=terlabel('Br','Fe','Ca');

title('A')