============================================================================
SESSION 697 -- BSFG path-integral 2-loop coefficient (exact decomposition)
============================================================================
  (A) sunset symmetry factor    S_sun  = 1/2        (= 0.5)
  (B) azimuthal phase           Phi_az = Vol(S^1) = 6.283185307179586  (= 2*pi)
  (C) Coulomb-gauge projector   P_Cou  = 1/(2*D_phys) = 1/8  (= 0.125)
  c_2 = S_sun * Phi_az * P_Cou  = pi/(2*D_phys) = pi/8 = 0.392699081698724
  reference pi/8                                       = 0.392699081698724
  exact match (1e-15)?          : True
----------------------------------------------------------------------------
  1/alpha_tree (S694/S695)      : 137.427500157
  1/alpha_UQFF^(2) (S696/S697)  : 137.034801075
  1/alpha_CODATA                : 137.035999084
  residual                       : -8.742 ppm (-0.0008742 %)
============================================================================
c_2_decomposition: predicted=0.392699081699 observed=0.392699081699 error_pct=0.000000 status=OK
alpha_inverse_v3_locked: predicted=137.034801075 observed=137.035999084 error_pct=-0.0008742 status=OK
Artifact written: _session697_c2_exact_result.json
