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from Eckart Inertias by Bryan Wong
A suite of MATLAB codes to calculate effective Eckart inertias for internal rotation

Y=four_coef_phi(f_phi)
function Y=four_coef_phi(f_phi)

Y=ifft(f_phi);

if mod(length(Y),2)==0

    Y(length(Y)/2+1)=[];

end

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