How about
ux = [1 0 -1 0 1];
uy = [0 1 0 -1 0];
% The order is CRU GPCC UDEL APH anticlockwise starting on positive x axis.
MAEx = [3.5 0 -0.5 0 3.5];
MAEy = [0 2 0 -8 0];
MBEx = [2.5 0 -2 0 2.5];
MBEy = [0 5 0 -4 0];
MDx = [0.1 0 -1.5 0 0.1];
MDy = [0 1 0 -2 0];
figure(1)
hold on
for i = 1:8
plot(i*ux,i*uy,'k--')
plot(MAEx,MAEy,'r',MBEx,MBEy,'b',MDx,MDy,'g','LineWidth',2)
end
text(8,0,'CRU')
text(-2,9,'GPCC')
text(-10,0,'UDEL')
text(-1,-9,'APH')
legend(' ','MAE','MBE','MD')
axis([-10 10 -10 10])
axis equal
axis off
