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syms ro Z a c S0  n0 Aj Po2 lambda Sph
Z0=5; S0=0.025; n0=10^25; Aj=0.002; Po2=21278; lambda=0.053;
R=sqrt((a-ro)^2+(c-Z)^2);
ne=n0*exp((-(Z-Z0)^2-ro^2)/2*S0^2);
Sph=ne*Aj*Po2^2*exp(-lambda*Po2*R)/(4*pi*R);
A=int(int(Sph,Z,0,0.1),ro,0,4);
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