T00_theta_exprs

T00_theta_exprs = [cos(\theta_i - \theta_j)*cos(\theta_k - \theta_l)/3, sqrt(3)*sin(\theta_i - \theta_j)*sin(\theta_k - \theta_l)/6, sqrt(5)*(cos(\theta_i - \theta_j - \theta_k + \theta_l) + cos(\theta_i - \theta_j + \theta_k - \theta_l) + 6*cos(\theta_i + \theta_j - \theta_k - \theta_l))/60]

Expressions for isotropic four-fold polarization tensor components (experimental angles)