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A=-19900;
B=438600;
C=0.0015;
t=2;

Io=0.2/(pi*(0.01)^2);

z=0:0.000000001:0.000001;


I=Io.*exp(-(A.*m+B).*z);
m=exp(-C.*I.*t);

plot(z,I);
plot(z,m);


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