Is there not the code with the FEX submission that generated the image? That'd seem to be the first place to start.
But, it really isn't that hard to get started; the axes starting point can be created as
hAx(1)=subplot(3,3,[1 2]);
hAx(2)=subplot(3,3,[4 5 7 8]);
hAx(3)=subplot(3,3,[6 9]);
box(hAx,'on')
axis(hAx(2),"square")
hAx(1).Position= hAx(1).Position+[0.05 0 -0.10 0];
hAx(3).Position= hAx(3).Position+[0.0 0 -0.05 0];
