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x=0.9;
y=0.8;
z=0.7;
B=2;
b=1;
[D,T]=meshgrid(3:0.1:8);
w1=sqrt(4*(B^2)+(x-y)^2);
w2=sqrt(4*(D.^2)+4*(b^2)+(x+y)^2);
E1=z+w1;
E2=z-w1;
E3=-z+w2;
E4=-z-w2;
Z=exp(-E1./T)+exp(-E2./T)+exp(-E3./T)+exp(-E4./T);
n1=exp(z./T);
n2=Z.*w2;
n3=sqrt(((w2).^2)*((cosh(w2./T)).^2)-4*b^2*((sinh(w2./T)).^2));
n4=sinh(w2./T).*sqrt((x+y)^2+4*(D.^2));
N=(n1)./(n2)*abs(n3+n4);
N1=(n1)./(n2)*abs(n3-n4);
m1=exp(-z./T);
m2=Z.*w1;
m3=sqrt(((w1).^2)*((cosh(w1./T)).^2)-4*(B^2)*((sinh(w1./T)).^2));
m4=sinh(w1./T)*(x-y);
M=(m1)./(m2)*abs(m3+m4);
M1=(m1)./(m2)*abs(m3-m4);
A=max(N,N1,M,M1);
C=max(2A-N-N1-M-M1,0);
plot3(D,T,C)
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